These coffin-like Brutalist balconies were inspired by a nearby mine.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This stucco building in North Africa was the first American-owned property on foreign soil.

The ruins of an early-18th-century complex that could once house up to 12,000 horses.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.

Mosaics, storks, and brothels—this ancient city has it all.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This contemplative sculpture made out of old machine parts is meant to be the first in a series of sculptures around the world.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

The world's first combination ski slope and power plant.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This sublime architectural marvel is a rare example of an expressionist church.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Copenhagen's celebrated theme park and gardens.

This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

In the 19th century, this canal provided power to mills, machine shops, and other businesses in the area.

Nassau Hall has served as army barracks, a museum, and played a key role in the American Revolution.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.