A mysterious phallic rock on the grounds of a Buddhist monastery.

An institution dedicated to curiosity, logic, riddles, and Mongolia's long history of puzzles.

Remnants of successive wars and Muslim colonialism in the 11th century.

A beautiful 19th-century Armenian mansion is preserved above an unassuming cafe.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

A modern artist's primitive stone faces and unique rock instrument join Iceland's terrain with its history.

Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

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

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Cryptic messages embedded in the New York City sidewalk.

Vast stretch of tide-pools with a unique Moroccan charm.

Founded as a refugee camp, now a popular tourist spot.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

A cemetery full of exquisite statuary, including a monument to a woman some say died of a broken heart.