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

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

This picturesque island graveyard is the final resting place of dozens of notorious pirates.

A war-torn Olympic relic is being overtaken by graffiti and nature.

The Avenue of Mausolea is a series of grand palatial tombs.

Once a bustling fishing port, this semi-ghost town is now more than 90 miles away from the shore.

An Argentinian businessman facing terminal cancer built this whimsical medieval village using salvaged materials.

The only town in the world with two exclamation points in its name.

An ever-changing gathering of crude wooden figures haunts the St. Lawrence River.

The world's largest wooden structure.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

A huge, bustling local market in Panama City.

A strip of neutral ground where the people of Tajikistan and Afghanistan come together to trade.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

Nature’s skyscraper launches out of the terrain with attitude.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

A cemetery housing wild west legends in South Dakota.

The South African dialect's complex history is immortalized in stone, in one of the world's only monuments dedicated to a language.

One of only two civilian settlements in the desolate lands of chilly Antarctica.

The birthplace of the very first human resident born in Antarctica.

Thanks to this small string of islands World War II still hasn't officially ended between Russia and Japan.