This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

A museum dedicated to the former country.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

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

After Christopher Columbus died, his son built a fancy house to rule from.

Built in 1512, the oldest cathedral in the Americas.

A remarkable range of flora and fauna are represented in this Dominican nature preserve.

The final resting place of Christopher Columbus - or possibly someone else.

The first hospital in the New World.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

This unassuming retro burger joint was billed as “diner of the future” at the 1939 World's Fair.

This old-fashioned candy shop, ice cream parlor, and diner served as the setting for one of TV's most controversial series finales.

This tiny New Jersey village has lived many lives but seems determined to remain a ghost town.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

A unique sculpture park that specializes in the huge and bizarre.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A mysterious dark-skinned Christ statue has been this town's religious center for centuries.

From a distance, Latin America's first Baha'i Temple looks like an enormous egg perched atop a hill.