Immortal combat in a Moscow museum.

An ever-growing literary collection housed in the apartment where the Russian author penned his final novel.

Volcanic irregularity? Odd erosion? Alien eggs? Local legends compete to explain these strange orbs.

Rare documents, old instruments, and gruesome specimens showcase the history of military medicine.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Statue of death tucked in the University of Medicine courtyard.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

This strategic isle was once swapped between empires and almost entirely destroyed in a bomb explosion.

This stone amphitheater was once part of Nazi Germany's plan to promote propaganda.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

A Buddhist shrine in a cave protected by macaques next to dark passages lined with creepy paintings.

A fiery crater has been burning in the Karakum Desert since 1971.