It was once nicknamed "the most bombed hotel in Europe."

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

Berlin's old airport.

The United Arab Emirates's biggest and oldest fort pays homage to a lost era.

A little sculpture with a large wardrobe.

A marvel of Byzantine engineering under the streets of Istanbul.

A pair of connected skyscrapers form this symbolic gateway.

In the hinterlands of Serbia's capital, a giant reflective mushroom houses an aeronautical history of the former Yugoslav republic.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

A unique seaside cave where Aleister Crowley faked his own death.

These roaring primates were considered a divine creature in the cosmology of the Maya.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Ancient rock-hewn town that witnessed key events of Georgian history.

Unusual building appears to be haphazardly built from randomly piled bricks.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

The decaying remains of a once-luxurious Soviet spa town.

The water here is so clear you can see the mysteriously sunken ship from the surface.

A 1970s resort city now stands abandoned, caught in the middle of a divided island.