A battle between nature and architecture in the Cambodian jungle.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

Legend says this sacred tree was a gift from goddess Athena.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

This historical village takes you back to the 19th century.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

One of the largest caves in the world open to the public.

This massive subterranean fissure is known as the "underground Grand Canyon."

Hundreds of caves once used to store grains and animal feed.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

The largest freshwater lake in the Florida Keys.

Mesoamerican monoliths and zoomorphic stones covered in royal visages, ancient mythology, and grand celestial events.

An impressive century-old, to-scale topographical map of Guatemala.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

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

An ornate Thai pavilion in the middle of Sweden.