The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

Ancient ruins hidden underneath a modern luxury hotel.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.