The world's largest banyan tree is followed by a community of worshippers.

A magical work of architecture where a wind turbine enables monks to levitate.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

This "Little Finland" started as a Finnish utopian society in Eastern Brazil.

The near loss of the stately fireplaces at this medieval castle spawned some of Britain's most crucial historic preservation laws.

This remote island in Iowa was abandoned after being devastated by flood.

The reason for the strange contortions in the trunks of these "drunken" pine trees in Russia is still a mystery.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

The pits used to load the nuclear bombs onto the aircraft that dropped them over Hiroshima and Nagasaki at the end of World War II.

An unusually designed bridge from the 1920s was built to withstand the tides and winds of Maine.

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

This abandoned palace and the stupas around it conceal beautiful Buddhist frescoes, statues, and silk paintings.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

A Jenga-style cylindrical tower of books that appears to go on forever.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.