The Basilica di Sant'Ambrogio is a historic church located in Milan, Italy. It was founded in the 4th century by Saint Ambrose, the city's patron saint, and is one of the most important examples of early Christian architecture in the region. The basilica features a Romanesque style, characterized by its distinctive bell tower and beautiful mosaics. Inside, visitors can find the crypt that houses the remains of Saint Ambrose, along with other notable relics. The church is also known for its stunning altar and intricate artwork, making it a significant site for both religious worship and cultural heritage in Milan.