The Leon Cathedral, also known as the Cathedral of Santa María de León, is an outstanding monument of Gothic architecture and one of the main symbols of the city of Leon in Spain. This Catholic church, built in the 13th-14th centuries, is considered one of the country's most important historical and cultural assets and a striking example of Spanish Gothic, attracting art and history lovers from all over the world.

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The main jewel of the cathedral is its unique stained-glass windows, covering a total area of about 1,800 square meters, making them one of the largest and most important collections of medieval stained-glass art in Europe. Most of these artworks date back to the 13th–14th centuries. Thanks to them, the interior of the temple, nicknamed the "House of Light," is filled with an incredible play of light and color.
In addition to its Gothic beauty, the cathedral hides even more ancient secrets. It was built on the site where Roman baths were located in the 2nd century. Beneath its foundation, the remains of Roman hypocausts—ancient heating systems—are still preserved, making a visit to the cathedral a true journey through the centuries, from antiquity to the High Middle Ages.