Basilica of Saint Peter: The Basilica of Saint Peter, officially known in Italian as the Basilica di San Pietro in Vaticano and colloquially called Saint Peter's Basilica, ranks second among the five major basilicas of Rome and its Vatican City enclave. Possibly the largest church in Christianity, it covers an area of 23,000 m² (5.7 acres) and has a capacity of over 60,000 people. One of the holiest sites of Christendom, it is the burial site of basilica namesake Saint Peter, who was one of the twelve apostles of Jesus, first Bishop of Antioch, and later first Bishop of Rome...

The Sistine Chapel: The chapel is rectangular and measures 40.93 meters long by 13.41 meters wide (the dimensions of the Temple of Solomon, as given in the Old Testament). It is 20.70 meters high and is roofed by a flattened barrel vault, with small side vaults over the 6 centered windows. The pavement (15th century) is in opus alexandrinum (see opus). A transenna in marble by Mino da Fiesole, Andrea Bregno and Giovanni Dalmata divides the chapel into two parts; the wider one, together with the altar, is reserved for proper religious ceremonies and other clergy uses, and the smaller one for the faithful...

Castel Sant' Angelo: The Castel Sant'Angelo is towering cylindrical building in Rome, initially commissioned by the Roman Emperor Hadrian as a mausoleum for himself and his family. The building spent over a thousand years as a fortress and castle, and is now a museum. The Tomb of Hadrian was erected on the right bank of the Tiber, between 135 and 139. Originally, the mausoleum was a decorated cylinder, with a garden top and the golden quadriga of the emperor...

School of Athens: The famous School of Athens is a depiction of philosophy. The scene takes place in classical times, as both the architecture and the garments indicate. Figures representing each subject that must be mastered in order to hold a true philosophic debate - astronomy, geometry, arithmetic, and solid geometry - are depicted in concrete form. The arbiters of this rule, the main figures, Plato and Aristotle, are shown in the centre, engaged in such a dialogue...

The Colosseum: The Colosseum's name is derived from a colossus (a 130-foot or 40-metre statue) of Nero nearby. This statue was later remodeled by Nero's successors into the likeness of Sol, the sun god, by adding the appropriate solar crown. Nero's head was also replaced several times by the head of succeeding emperors. At some time during the Middle Ages, the statue disappeared; experts suspect that, since the statue was bronze, it was melted down for reuse.
After the colossus' disposal, the link to it seems to have been forgotten over time, and the name was corrupted to Coliseum in the Middle Ages...

The Pantheon: The Pantheon is a building in Rome which was originally built as a temple to the seven deities of the seven planets in the Roman state religion, but which has been a Christian church since the 7th century. It is the best-preserved of all Roman buildings and the oldest important building in the world with its original roof intact. It has been in continuous use throughout its history. The original Pantheon was built in 27 BC-25 BC under the Roman Empire, during the third consulship of Marcus Vipsanius Agrippa, and his name is inscribed on the portico of the building...

The Spanish steps: The Spanish Steps (Scalinata di Spagna) in Rome ramp a steep slope between the Piazza di Spagna at the base and the church Trinità dei Monti above. The monumental stairway, of 138 steps, was built with French diplomat Stefano Gueffier’s funds (20,000 scudi) in 1723–1725, linking the Bourbon Spanish embassy to the Holy See, today still located in the piazza below, with the Trinità dei Monti church above. The Spanish Steps were designed by Francesco De Sanctis after generations of heated discussion over how the steep slope to the church on a shoulder of the Pincio should be urbanized...