The Basilica of San Isidoro is a historic church located in Leon, Spain. Built in the Romanesque style during the 11th century, it is known for its stunning architecture and rich history. The basilica serves as a burial site for several kings of Leon and is often referred to as the "Sistine Chapel of Romanesque Art" due to its impressive frescoes. Inside, visitors can admire the beautiful Royal Pantheon, which houses the tombs of the medieval monarchs. The basilica also features intricate carvings and a remarkable altar, making it a significant cultural and religious landmark in Spain.