The Delessert Cipher — Hyères' Lost Botanical Conspiracy

Your quest begins at Place Massillon, once called Place de l'Horloge due to the clock on the gate dating back to the 16th century. This iconic square, at the foot of Hyères' medieval old town, is the ideal starting point to explore the City of Palms. Before you stands the Porte Massillon, the main access to the city built from the 13th century. This fortified edifice, erected in 1562 under Charles IX, is the last vestige of Hyères' medieval ramparts. Approximately 15 meters high with its belfry and Renaissance clock, it was classified as a Historic Monument in 1943. Here, in this historic urban environment, the first clues to the conspiracy await you.

Continue your journey into the old town of Hyères, a protected area since 1969 for the preservation of its Provençal heritage. You walk through cobbled streets and along 14th-16th century houses, witnesses to the medieval city founded in the 10th century and fortified in the 13th century by Raymond Bérenger V. The restored Former Chamber of the Counts of Provence reveals fragments of comital history. Nearby, the Église Saint-Louis, a Gothic parish church built between 1630 and 1650 under Louis XIII, invites you to decipher hidden symbols in its Provençal style, single nave, and typical 17th-century campanile bell tower, housing historic organs restored in 2005.

The Avenue des Palmiers offers a lush break in your investigation. Approximately 1 km long, it connects the city center to the Olbius-Riquier park, lined with over 200 Phoenix dactylifera palms introduced in the 19th century. These trees are the vegetal emblem of Hyères, nicknamed the 'City of Palms' since the plantings by the Counts of Provence in the 13th century. This historic promenade, popular with British travelers in the 19th century, holds messages related to botany. Each palm tree could be a silent witness to the secrets you seek to unravel, revealing information about species origins and their uses.

Your route then leads you to the Jardin Olbius Riquier, located about 1 km walk from Place Massillon via the Avenue des Palmiers. This public garden, created in 1865 by local horticulturist Olbius Riquier (1814-1887), covers 7 hectares. It houses 19th-century greenhouses, a rose garden, and a collection of exotic plants, listed in the Inventaire des Monuments Historiques in 1997. It is in these greenhouses that botanists of the past would have hidden the key elements of the conspiracy. Clues mingle with rare species, guiding you through this unique Provençal heritage, where each plant could hold a part of Delessert's cipher.

By exploring the Old Town of Hyères, from the Porte Massillon to the Jardin Olbius Riquier, you have unraveled the threads of an intrigue dating back to the origins of the City of Palms. This 1.5 km circuit has taken you through centuries of history, from medieval fortifications to exotic gardens. As an emissary, you have not only solved Delessert's cipher but have also discovered the many facets of Hyères' heritage, in Provence-Alpes-Côte d'Azur. This interactive visit of Hyères, whether with family or friends, offers a deep understanding of the monuments and local history, far beyond a simple GPS treasure hunt.