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

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

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

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

This ancient jade mask depicting the Zapotec bat god was found in the ruins of the pyramids of Monte Alban.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

This demon atop the Notre-Dame de Paris looks utterly bored.

This 12-inch-tall wooden sculpture of a winged Virgin Mary has inspired much devotion and countless replicas.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The world's tallest aluminum statue is also the world's tallest image of a winged Virgin Mary.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

The most complete statue of this Aztec god sits a top a throne carved with images of hallucinogenic plants.

Quito's historic, main square dates back to the 16th century.

A lush indoor jungle fills this bustling Madrid transportation hub.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

A former prison complex now displays a historic collection of inmate artwork.

This influential Renaissance-era library was once the haunt of kings and monks.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.