Venice's "Island of the Mad."

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The underground sanctuary of a mysterious ancient cult.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

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

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A 16th-century horror show built in a lovely Italian garden.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

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

Haunted by its violent past, this colonial bastion was the largest Spanish military installation in the Americas.

A monument to the conquistador became increasingly controversial in the very city that he founded.

A Christian monastery stands on what was once a holy Incan temple.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

It took 82 years and four different plaques to finally get the story right.

An Inca spa, military outpost or maybe… both?

The shockingly unspoiled Peruvian tomb of the Lord of Sipan was once guarded by a footless warrior.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

The large collection of pre-Columbian pottery might make you blush.

Hundreds of mummies in a silent room, some with eerily pained expressions preserved on their faces.

This Peruvian bone silo lined with hanging human skeletons and hundreds of skulls is topped with a remarkable Michelangelo replica.

An Archaeological Wonder of Peru, and the largest stone ruin site in the New World.