Lyon Cathedral, also known as Cathédrale Saint-Jean-Baptiste de Lyon, is a Roman Catholic cathedral located in the heart of the old town of Lyon, France. Built between the 12th and 15th centuries, the cathedral is dedicated to St. John the Baptist and is a prime example of Gothic architecture.

The cathedral has two distinct parts: the old part, with a Romanesque influence, and the new part, with a more Gothic style. The facade features intricate details, including a rose window and a statue of the Virgin Mary. Inside, the cathedral is home to beautiful stained glass windows, including the largest Gothic stained glass window in the world, as well as ornate carvings and sculptures.

One of the highlights of Lyon Cathedral is its astronomical clock, which was constructed in the 14th century and is still in working order. Visitors can watch the clock's various mechanisms in action, including its dials, astrolabe, and calendar. The clock also features a set of automatons that move every hour, depicting a range of scenes from everyday life.

The cathedral is also home to the Lyon Museum of Sacred Art, which houses a collection of religious art and artifacts from the cathedral and other churches in the region. The museum's collection includes paintings, sculptures, textiles, and religious objects, providing visitors with a glimpse into the rich history and culture of Lyon and its Catholic heritage.