St. Eugene's Cathedral, also known as Basilica di San Eugenio, is a Roman Catholic church located in the Vatican City area of Rome. It was designed by architect Giacomo della Porta and completed in the early 20th century. The cathedral is dedicated to Saint Eugene, a 4th-century pope, and features a beautiful neoclassical facade and stunning interior artwork. The cathedral is known for its impressive dome and elegant altar, which showcases intricate mosaics and sculptures. It serves as a place of worship and a venue for various religious ceremonies, attracting both locals and tourists who appreciate its architectural beauty and historical significance.