The only castle in North America to ever house European sovereigns.

Part bookstore, part café, and part forest.

Two waterfalls flow down the cliff faces decorated with rare natural basalt columns.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

Mexico's astounding mummy museum with "the world's smallest mummy."

Kitschy horror displays now fill the house where some very real serial killing took place.

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

A modernist landscape of water and sci-fi concrete.

Avoid gangster interaction while window-shopping.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

One part antique store, one part curiosities hodge-podge.

Erotic art covers the walls of the largest ancient pleasure palace.

The 10,000 Torii shrine.

A bit of retro transportation flair preserved in the world's largest department store.

Ancient snack bar of the Roman Empire re-opened.

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

2300-year-old Roman road connecting the empire.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

This bridge was constructed from the rubble of the infamous Bastille.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Every equinox this Maya pyramid puts on a spooky ancient light show.