Light still pours into the ruins of this ancient Islamic observatory.

Where the father of Persian poetry is laid to rest.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

Time capsule of a museum, in which the Soviet Union remains alive and kicking.

The central mosque of this Mali town is entirely built from mud.

The souls of the dead have made these Ghanese crocodiles shockingly docile.

The last remaining site of Yoruba worship of the fertility goddess.

Africa's Venice on stilts.

Rumors and legends of secret Nazi activities surround this eerily remote island mansion.

The UFO capital of Australia is the outback’s answer to Roswell.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

A desert that evokes the surreal.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

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

The so-called "Richest Village In China" is either a model Communist town or a dystopian sham.

The largest Lenin statue in Central Asia was moved to an empty field rather than being destroyed.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

Eastern Bloc nostalgia, anybody?

A museum in the former home of Marxist revolutionary Leon Trotsky.