5,000 skulls in memorial to those killed by the Khmer Rouge.

A battle between nature and architecture in the Cambodian jungle.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

Founded as a refugee camp, now a popular tourist spot.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

This ancient theater was once the home of fierce gladiatorial battles.

A cathedral resurrected from the ashes of one of Europe's greatest urban fires.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

A subterranean house of worship carved right out of the bedrock.

Legend says lovers who hold hands while venturing along this stone jetty and kiss at the end will remain together forever.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

A musical instrument played by the sea.

A garden of flying flowers.

The world's tallest boat lift stands as a massive piece of industrial tourism.

What was once a bustling mining installation is now a bustling hub of contemporary art.

Bridge that died in war and was resurected.

A giant bug impaled on a 75-foot-tall needle.