This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

The bones of some 7,000 soldiers killed in the historic Battle of Solferino are stored here.

The skulls and bones of thousands of soldiers line the walls of this small Italian chapel.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A historic observatory precariously perched at the "Top of Europe."

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Walk through a restaurant's refrigerator door to reach this hidden bar.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A kaleidoscopic warehouse-maze of handmade neon signs.

The personal library of the founder of modern neurology is open to visitors.

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

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

The curious underground history of keeping Paris clean.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

An antique curios dealer and hybrid taxidermist.

A charming flea market shop dedicated to retrofuturistic apparati.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Notorious artist squat renovated into legal studios.