St. Peter’s Basilica
The largest religious building in the world, not to mention the center of Christianity, I suppose, belongs in this list. St. Peter’s Basilica in Vatican City is built over the tomb of St. Peter the Apostle, and is the largest church in the tiny country. It is truly immense: the church covers an area of 5.7 acres (2.3 ha) and has a capacity of over 60,000 people.
Before St. Peter’s Basilica as we know it was built, there was already a church there built in 324 C.E. by Emperor Constantine, the first Christian emperor of Rome. That church lasted for about 1,200 years until the crumbling structure was torn down to build the modern-day basilica. St. Peter’s Basilica was built by the who’s who of the Renaissance era: Michelangelo designed the dome, Gian Lorenzo Bernini designed the main square, and Donato Bramante was the first architect of the church.