This unreal Portuguese palace looks as though it's made from a pile of different castles.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

This coffee shop lies hidden beneath a historic church.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Wild West history in Hollywood style.

This Latvian shot factory is still used twice a year to manufacture bullets the old-fashioned way.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

An artful memorial to 4,000 fateful oranges.

The medieval prince founded the first library in Ukraine at Saint Sophia's Cathedral where he was interred.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

There is a mouldering Jewish cemetery hidden away in the capital of Moldova.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

When it comes to handsignals (and colonialism) rock always beats scissors.