The Church of Santa Maria in Aventino is a historic church located on the Aventine Hill in Rome, Italy. It dates back to the 5th century and is known for its beautiful Romanesque architecture. The church features a stunning wooden ceiling and a lovely apse mosaic that depicts the Virgin Mary. One of the unique aspects of Santa Maria in Aventino is its serene garden and the famous Keyhole view of St. Peter's Basilica. Visitors can look through the keyhole of the Knights of Malta gate to see a perfectly framed view of the basilica, making it a popular spot for tourists.