An abandoned shopping gallery built during Fascist Italy tucked in the center of Palermo.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Haunting graffiti left by prisoners of the Spanish Inquisition.

Cave shrine on Monte Pellegrino.

Every inch of this chapel is covered in craftsmanship from across the world.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Thousands of well-dressed mummies below a monastery.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Certain traditions prevail on the least-visited island of the Aran Islands.

The most alien-looking place on Earth.

Join in a Seance at the Swedenborgian Church.

A legendary speakeasy bookstore returns from the brink.

Harlem park dedicated to compulsive hoarders killed by their own junk.

A living archive of urban activism and space reclaimed.

Antique frame collection with 2,400 frames.

A collection of abandoned typographic signs from Berlin and beyond.

A slice of central Asia in the middle of Berlin.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

A marker honors the brief peace found by a tormented artist in the fictional land of Kcymaerxthaere.