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

Dedicated to the art of hunting, with juxtapositions of contemporary art.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The celebrated eyesore created by starry-eyed sweethearts.

Two stunning 17th-century libraries and a cabinet of curiosities.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

A fountain standing as a testament to a doomed alliance.

A marvel of Byzantine engineering under the streets of Istanbul.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

27-room home built with the fortune of a sugar magnate.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

An essential stop before plundering, BYO Cutlass.

Only hotel where you can legally launder money.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

Furniture tries to escape an abandoned building in San Francisco.

These subterranean storage areas hold emergency water reserves.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.