St. Peter's Basilica-The world center of the Catholic Church and the largest Roman Catholic building in the world. Also known for its astounding work of art.
The Colosseum-Considered an architectural masterpiece, the Colosseum hosted many gladiator fights and held up to 60,000 spectators.
The Pantheon-The oldest standing domed structure in Rome. Built as a temple honoring all the Roman gods.
Trevi Fountain-The largest and most intricate of the baroque fountains in Rome, combining sculpture, nature, and architecture.
The Spanish Steps-The longest and widest staircase in Europe. Leads from the Piazza di Spagna to the church of Trinita dei Monti. MLS