Ranked alongside the Pyramids of Giza and the Taj Mahal as the most elaborate mausoleums ever built, Castel Sant'Angelo is the final resting place of Roman emperor Hadrian. Enter this ancient wonder – without waiting in line for centuries – with a fast-track ticket to explore this monumental fortress on an enthralling guided tour. Wander cavernous hallways, hear tales of political backstabbing, see spectacular murals, and take in endless views of Rome from the rooftop.