Have you been to Vatican City? If so you've certainly seen St. Peter's Basilica. Did you know its construction was completed on this day in 1626? The original structure dated back to the 4th century and was badly in need of some TLC by the time 1506 rolled around. Donato Bramante's design was the first one chosen, but seven years later the Pope died and Bramante was removed from the project. He and his design was replaced by Giuliano da Sangallo, Fra Giocondo and Raphael. The Basilica's plan changed many, many times after that, having had some of the best known artists and architects play a part in the construction. Michelangelo, Bernini, Domenico Fontana, the list goes on. Today St. Peter's Basilica stands at just over 448 feet and remains the tallest dome in the world.