Memorial to the 89 children killed during the NATO bombing of Serbia.

A giant scrap metal troll rests his hands on top of a dilapidated building covered in graffiti.

A museum dedicated to the centuries-old cave dwellings that housed marginalized communities on the outskirts of the former capital of Muslim Spain.

A vertical tube that allows you to see what's going on underneath the Antarctic sea ice.

Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

The northernmost point of continental Africa—or is it?

Also known as the Great Mosque of Damascus, this is one of the world's largest and oldest mosques.

While it would not look out of place among Serbian spomeniks, this massive Bulgarian monument commemorates one of their defeats.

This building is a recreation of the gatehouse that separated Los Alamos from the outside world during the era of the Manhattan Project.

At 431 feet and 10 inches, this is the longest historic covered bridge in the United States.

A charming Amazigh village carved into a mountaintop.

The world's largest collection of historic U.S. military naval vessels.

This millennium-old site reflects a time when sugar was a treasured commodity.

This small museum is home to cannons cast by Paul Revere and the last remaining uniform of Egyptian President Anwar Sadat.

This enormous gold Buddha statue was hidden inside a stucco decoy for centuries.

Napoleon’s home in exile, decorated with poisonous wallpaper.

A museum dedicated to secret surveillance.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

The only Leonardo Da Vinci painting in the Western Hemisphere.

This eerie sculpture overlooks what was known as the Road of Bones under Joseph Stalin.

A well-preserved set of ruins not far from Lovelock.

After witnessing the rise and fall of three empires, this ancient city was finally destroyed by a series of earthquakes.

Ride on a fully-restored Nike nuclear-tipped missile elevator from the Cold War.

Named for a prominent scout and explorer, this Wyoming state park encompasses a replica of an 1840s trading post, a 19th-century Army outpost, and early 20th-century automobile lodgings.