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The Cathedral of Saint-Jean-Baptiste in Lyon boasts an ancient astronomical clock. This impressive timekeeping masterpiece not only tells the time, but also displays the position of planets and celestial events with stunning accuracy. 2. Inside the cathedral, you can find a mysterious hidden chapel known as "La Crypte des Arches." This hidden gem is tucked away beneath the main floor and features stunning Gothic architecture and ancient religious artifacts. 3. The cathedral's towering spire measures a staggering 80 meters, making it the tallest point in Old Lyon. Climb to the top for panoramic views of the city, and be sure to spot the unique gargoyles adorning the corners. 4. Did you know that the cathedral's construction took over 300 years to complete? Starting in the 12th century, it underwent numerous additions and changes, resulting in a stunning blend of architectural styles, from Romanesque to Gothic. 5. Venture into the crypt beneath the cathedral, and you'll discover a macabre sight: a bizarre collection of ancient bones arranged decoratively. This eerie and unique crypt is a testament to the cathedral's long history and the veneration of saints.