Mosaics, storks, and brothels—this ancient city has it all.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

Traditional 11th-century outdoor tannery.

Crumbling necropolis set high above Fez.

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

A windswept necropolis carved into the rocks overlooks the "most Portuguese town in Portugal."

Houses are tucked between, on, and underneath giant boulders.

The middle finger of modernity.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

A legendary speakeasy bookstore returns from the brink.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

New York's oldest magic store.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A terrific purveyor of natural history objects and curios.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A Bibliophile's Dream.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.