Independence National Historical Park — Echo of Liberty
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Independence National Historical Park, Philadelphia, USAIndependence National Historical Park — Echo of Liberty
📍 Independence National Historical Park, Philadelphia, USA·🕐 2h – 2h30·📍 ~2 km
Also available as:HistoricalMysterySpy thrillerCinema

Independence National Historical Park — Echo of Liberty

Decipher the Echo of Liberty: uncover a Revolutionary conspiracy surrounding the Liberty Bell's secret inscription and a vanished artifact that challenges the founding of freedom.

📱 1 to 10 phones · 1 team per phone · Independent codes

Difficulty
·From age 10 years
Starting point :In front of the Liberty Bell Center, Market Street

In the heart of Philadelphia's Independence National Historical Park, the Liberty Bell stands silent, its biblical inscription 'Proclaim Liberty Throughout All the Land' masking a darker truth

8
stages
~2 km
route
2h – 2h30
at your pace
🚶
walking

Independence National Historical Park — Echo of Liberty

🎭Your Mission

You are Thomas Jefferson, principal author of the Declaration of Independence, on July 4, 1776, in Philadelphia, Pennsylvania, as the future of the United States hangs in the balance.

Discover the beating heart of American democracy, where ideals of liberty were forged and etched into history.

Far more than an escape game

A game, a guided tour and a heritage guide — all in one

You're not just buying an escape game. You're carrying a living guide — historical anecdotes, forgotten legends, key monuments, hidden architecture — unfolding as you go.

🏛️
Hidden historical gems

At each stop, places ordinary guides miss — secret façades, sculpted crests, alleys steeped in history.

📜
Anecdotes & legends

Every riddle is rooted in a real historical fact or local legend. You leave with dozens of stories to tell.

🏗️
Architecture & heritage

Learn to read buildings — flamboyant Gothic, Baroque, Art Deco — like a real art historian, while having fun.

🚶‍♀️
Immersive wandering

Walk through the city like a novel's character — every alley becomes a stage, every square a theatre.

🎙️
Immersive audio narration

A voice walks with you at every step, tells the story of each place, reads clues, adds a cinematic feel.

📲
Yours forever

Keep access to the guide & game for 1 year. Come back any time, share it with friends.

« You will not leave this city the way you entered it. »

How does it work?

🏛️
Outdoor escape game

Explore the city on foot solving puzzles based on real historical facts. No locked room — the city is your playground.

📱
On your smartphone

No app to download. Play directly from your browser. Guided step by step, at your own pace.

👨‍👩‍👧‍👦
Unlimited players

One purchase per phone is enough. Play with family, friends or as a couple — everyone participates.

🎯
Augmented reality

Point your phone at the façade: a historical character appears and speaks to you in your language. Golden letters magically write themselves on the wall to reveal the puzzle answer.

🤖
AI that helps you

Stuck? Progressive personalised hints. The character repeats the puzzle on demand — at your own pace.

🗣️
32 languages

French, English, German, Spanish, Italian + 27 other languages auto-translated by AI.

🎟️

Want to go deeper?

Places tied to your adventure — optional entries, totally up to you · per person

Museum of the American Revolutionoptional
$24. Explore original artifacts and immersive exhibits on the Revolutionary War.
Optionnel
/pers.
National Constitution Centeroptional
$19. An interactive museum dedicated to the U.S. Constitution, featuring engaging multimedia exhibits.
Optionnel
/pers.
Cheesesteak Tasting at Pat's King of Steaksoptional
$10-15. Taste Philadelphia's iconic sandwich, invented in 1930, at one of its historic locations.
Optionnel
/pers.
Elfreth's Alley Museum Touroptional
$10. Walk through the oldest continuously inhabited residential street in the U.S., dating back to 1702.
Optionnel
/pers.
Budget if you do them all / pers.~0
« We hold these Truths to be self-evident, that all Men are created equal... »
Thomas Jefferson et al., Declaration of Independence, July 4, 1776

The story that haunts this land

Your journey begins in front of the Liberty Bell Center in Philadelphia, where the echo of freedom resonates. Forged in 1752 by London's Whitechapel Foundry, the Liberty Bell, 3.3 feet high and weighing 2080 pounds, announced the first public reading of the Declaration of Independence on July 8, 1776. Its famous crack, which appeared during a test that same year, became a symbol of fragility and perseverance. The center, opened in 2003, protects this monument that attracts 3 to 5 million visitors annually to Independence National Historical Park, a UNESCO World Heritage Site since 1979.

A short walk away, Independence Hall, a National Historic Landmark, stands imposing. Built between 1732 and 1753 in Georgian style, this 105-foot long by 65-foot wide building was the scene of the adoption of the Declaration of Independence on July 4, 1776, and the signing of the Constitution in 1787. It is here, in Philadelphia, that Founding Fathers like Thomas Jefferson and John Adams drafted the nation's foundational documents. The old tower once housed the first American flag, testifying to the early history of Philadelphia.

Right next door, Congress Hall, completed in 1789, plunges you into the young republic. This red-brick building served as the United States Capitol from 1790 to 1800, accommodating up to 200 representatives and senators. It was within these walls that George Washington was elected for his second term in 1793 and John Adams was inaugurated president in 1797. This site, preserved since 1948, is an integral part of Philadelphia's heritage and the Independence National Historical Park, marking a crucial decade before the capital moved to Washington D.C. in 1800.

Your route then takes you to Washington Square Park, one of Philadelphia's five original public squares, founded in 1682. This approximately 4-hectare area with tree-lined paths served as a cemetery during the Revolutionary War and the yellow fever epidemic of 1793. The Tomb of the Unknown Soldier, erected in 1957 and adorned with an eternal flame lit since 1954, honors revolutionary soldiers. A block from Independence Hall, this square served as a camp for the Continental Army, a poignant testament to Philadelphia's role in the nation's founding.

Finally, your immersion in Philadelphia's history concludes with a deep understanding of what it means to be at the Birthplace of American Democracy. You have walked in the footsteps of George Washington and Benjamin Franklin, seen the places where decisions were made, and felt the spirit of a nascent nation. This thematic tour in Pennsylvania, a true GPS scavenger hunt, offers a unique perspective on Philadelphia's heritage. You take away not only factual knowledge but also a tangible connection to the ideals that shaped the United States.

1751
The Liberty Bell is ordered for the Pennsylvania State House.
1777
The Liberty Bell is hidden to prevent it from being melted by the British.
1787
The U.S. Constitution is signed in Philadelphia.

The Route

8 stages through the city

The gameplay: AR, camera, hidden clues

📱Search clues with your cameraRA

At each stop, open your phone camera: an augmented reality character appears on the façade and speaks your language. Hunt the clue — it materializes as golden letters on the real wall or floats in front of you. When you find it, the phone vibrates, an AR chest opens and reveals your answer fragment. 8 stops, 8 clues to find with the camera, 1 final code.

🎭

The stops on your route are a surprise. You'll discover them one by one, guided by your phone, starting from the meeting point.

8
original puzzles
24
min of narration
🪙 24
TripCoins granted
16
GPS waypoints

How does it work with a group?

One phone = one team. Pick the number at checkout (1 to 10).

🧍
1 phone

Solo, or a group sharing the screen. One team, one code.

👥
2-3 phones

Family, couple, or 2-3 teams competing. Each phone has its own code and its own score.

👨‍👩‍👧‍👦
4 to 10 phones

Friends, bachelor/bachelorette, small office outing — each their own code, each plays at their own pace. Tiered pricing then €6 flat per phone from the 6th.

  • All codes are independent — play at the same time OR separately, each team advances at its own pace.
  • Leaderboard between your teams + global game leaderboard — each score appears in the public ranking.
  • More than 10 phones or need a personalized quest? Discover custom tours.
🕒No date to pick · Code valid 1 year · Play whenever you want

Ready to live this adventure?

Get my code · 12€

No calendar booking. Code sent immediately by email.

🔒 Secure payment · Code in 5 min · Free cancellation

Practical info

Starting point
In front of the Liberty Bell Center, Market Street
Directions on Google Maps
🕐
Duration
2h – 2h30
At your own pace
👥
Players
1-5 people
From age 10
📍
Distance
~2 km
Historic district
Accessibility
Full
Flat route
🌐
Languages
17 languages
Built-in translation

Why this route?

🔔

American Icon

Follow the echo of the Liberty Bell through historic streets.

🗺️

Ancient Plan

Reconstruct an architectural map or a forgotten guild register.

Revolutionary Legacy

Discover how the ideas of liberty were etched into the city.

Every step reveals an echo of the past.

Listen to the voice of independence.

★ Innovation 2026

9 features nobody else has

OddballTrip combines gamified play, augmented reality and AI. All our competitors deliver 1 or 2 of these angles. We deliver all 5.

🎁

AR treasure chest

A golden chest floats in front of the monument. Tap → opening animation → reveals a secret message.

🧙

AR narrator character

Point your phone at the façade: a knight, witch, monk, sailor, detective or ghost appears full-screen and speaks to you in your language with their dedicated ElevenLabs voice (each character has their own unique voice) — your living guide.

📜

Magic golden letters

At the puzzle climax, golden letters magically write themselves on the real wall — that's the puzzle answer. An unforgettable visual effect.

🎧

Written + audio narration

Every puzzle available as text AND voice-over: read at your own pace or listen eyes-free while walking. Great in groups and for accessibility.

🧭

360° radar + vibration

A mini-radar shows the target even behind you, and the phone vibrates when you aim in the right direction.

📸

Heritage storytelling

Every puzzle weaves in real historical facts (architecture, era, anecdotes). You learn by playing — like a gamified audioguide.

🤖

Progressive AI hints

3 levels of AI-generated help: vibe → where to look → answer format. You're never stuck.

🤳

AR selfie memento

At the end of the game, capture a selfie with OddballTrip banner + mascot, shareable on Instagram, TikTok.

📱

Zero app to install

PWA technology: open the link, it plays in your browser. Same quality as an app, no App Store hassle.

Frequently asked questions

Q01Do I need to download an app?

No, never. You get a link, you click, it plays in your browser. That's the point of a PWA: same as an app, without the hassle.

Q02Does it work offline?

GPS yes (handled by your phone). Maps yes (tiles cached). AI and hints need an intermittent 4G connection.

Q03How long does a game take?

1 h 30 to 2 h 30 depending on your pace. The timer runs but only for the leaderboard — you play at your own tempo.

Q04What happens if I'm stuck?

You get 3 levels of hints per puzzle (increasing penalty). If truly stuck, you can skip the step (45-min penalty but you keep going).

Q05What's the age range?

From 12 without an adult, from 6 with an adult reading puzzles. Works for families, couples, friend groups, companies.

Q06What if my city isn't in the catalogue?

Pre-register or contact us — we'll email you as soon as your city is live.

Q07What is augmented reality exactly?

Point your phone at the façade: a historical character appears full-screen and speaks to you in your language. At the puzzle climax, golden letters magically write themselves on the real wall — that's your answer. After each puzzle solved, a treasure chest floats in front of you. Seeing is believing.

Avis des aventuriers

Soyez le premier à partager votre expérience.

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Your turn to play

Discover the beating heart of American democracy, where ideals of liberty were forged and etched into history.

12€
1 phone
23€
2 phones
33€
3 phones
42€
4 phones
50€
5 phones
56€
6 phones
62€
7 phones
68€
8 phones
74€
9 phones
80€
10 phones

1 purchase = 1 phone. Play several on the same device.

🕒No date to pick · Code valid 1 year · Play whenever you want
Get my code · 12€

No calendar booking. Code sent immediately by email.

🔒Secure payment · Code in 5 min · Free cancellation

🪙+24 TripCoins granted with your booking

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