A battle between nature and architecture in the Cambodian jungle.

The prototype for all Nazi concentration camps.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

A marvel of Byzantine engineering under the streets of Istanbul.

An encyclopedic collection of mammal penises.

A museum dedicated to secret surveillance.

What happens when you cross a mayor and a painter?

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

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

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

In this town's main square resides a statue of none other than the 43rd President of the United States.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

According to a local legend, this old castle could only be built after a woman was immured in the walls.

Macabre astrological automaton clock dating to the late 1400s.

A curious cave church carved into the face of a cliff.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This is the birthplace of Vlad the Impaler Vlad III Dracul.

A black sand beach where glacial fragments wash ashore and look like sparkling diamonds.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

A vast, otherworldly collection of Buddhist stupas.