Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

A shipwreck named Desire at the shore of Batumi.

Georgia's answer to Easter Island immortalizes the nation's great poets, artists, and leaders in stone glory.

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

One of the most easily accessible examples of the rare 1960s UFO houses.

The footprint of a frustrated devil in Munich's Cathedral.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

"The most colorful grottoes of the world.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

Ruins of a German Castle on top of a towering stone pillar.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Ancient structures used to make and preserve ice in the deserts of Persia.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

The palace of the King of Kings, burned by Alexander the Great.

Iran's colorful terraces are a rare geological masterpiece.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

An abandoned swimming pool decays on the outskirts of Berlin.