The largest church in the world, St. Peter's Basilica in Vatican City is a masterpiece of Renaissance architecture. The church houses priceless art, including Michelangelo's Pieta and Bernini's St. Peter's Baldachin. It's also the final resting place of many popes and an essential pilgrimage site for Catholics.

Originally built as a temple to the Roman gods, the Pantheon is now a church known as Santa Maria ad Martyres. Its stunning dome, a marvel of ancient engineering, remains the largest unreinforced concrete dome in the world. The oculus at the top allows a beam of sunlight to stream into the church, creating a unique atmosphere.

One of Rome's oldest churches, Santa Maria in Trastevere is a masterpiece of medieval mosaics and frescoes. The church's beautiful façade and vibrant interior make it a must-visit in the charming Trastevere neighborhood.

This basilica is one of the four major basilicas in Rome and is known for its stunning mosaics and gold coffered ceiling. The church is also home to the relics of the Holy Crib, making it a popular destination during Christmas.

What makes San Clemente unique is its multi-layered history. This church, located in the heart of Rome, features not only a stunning medieval basilica but also an underground level that reveals ancient Roman buildings and a fourth-century church. It's like taking a journey through time beneath the streets of Rome.

Also known as the Basilica of St. John Lateran, this is the cathedral of the Bishop of Rome (the Pope) and is considered the mother church of all Catholic churches worldwide. Its grand façade, impressive interior, and the Scala Santa (Holy Stairs) make it a significant spiritual and historical landmark.