The Trevi Fountain is a fountain in the Trevi district in Rome, Italy, designed by Italian architect Nicola Salvi and completed by Giuseppe Pannini and several others. It is the largest Baroque fountain in the city and one of the most famous fountains in the world.

Piazza Navona is a square in Rome, Italy. It is built on the site of the Stadium of Domitian, built in the 1st century AD, and follows the form of the open space of the stadium. The ancient Romans went there to watch the agones, and hence it was known as "Circus Agonalis". It is believed that over time the name changed to in avone to navone and eventually to navona.

St. Peter's Square is a large plaza located directly in front of St. Peter's Basilica in the Vatican City, the papal enclave inside Rome, directly west of the neighbourhood or rione of Borgo. Both the square and the basilica are named after Saint Peter, an apostle of Jesus considered by some to be the first Pope.

It is the Mausoleum of Hadrian, usually known as Castel Sant'Angelo,​ because it was initially commissioned by the Roman Emperor Hadrian as a mausoleum for himself and his family. The building was later used by the popes as a fortress and castle and is now a museum. It is a towering cylindrical building in Parco Adriano, and this structure was once the tallest building in Rome.