Notre-Dame de Paris is a medieval Catholic cathedral located on the Île de la Cité in Paris.

The Hagia Sophia is a grand structure with a dome that appears to be miraculously suspended in the air.

The Pantheon is a former Roman temple, now a Catholic church, in Rome, Italy.

Westminster Abbey is a large, mainly Gothic abbey church in the City of Westminster, London.

St. Peter's Basilica is the largest Christian church in the world.

The Sistine Chapel is a world-renowned chapel located inside the Vatican City exhibiting breathtaking frescoes.

The Church of the Holy Sepulchre is a church in the Christian Quarter of the Old City of Jerusalem.

The Florence Cathedral, formally known as the Cattedrale di Santa Maria del Fiore, is a stunning Gothic-style cathedral located in Florence, Italy.

The Cologne Cathedral is a renowned monument of German Catholicism and Gothic architecture.

Saint Basil's Cathedral is a colorful, onion-domed structure located in Moscow's Red Square.