This woodland architectural installation acts as a camera obscura for the heavens.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

A former electrical substation is now home to an eccentric junk art masterpiece.

Giant heads occasionally litter the industrial Houston neighborhood where sculptor David Adickes has his studio.

Official museum, hall of fame, and repository of the Texas Rangers.

Cold storage for agricultural biodiversity.

Fire meets ice at the southernmost volcano on Earth.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The crumbling remains of a 19th century fortess.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

When ecosystems collide in the arid Southwest.

An emerald-green grotto just a short trip from Austin.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The United States Capitol's former columns still stand.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

Decaying military base deactivated in the 70s is now visited by urban explorers and military enthusiasts.

Yugoslavia's biggest underground airport lies in ruins.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

America's only nuclear missile silo open to the public.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

One part antique store, one part curiosities hodge-podge.

Mysterious glowing orbs float through the desert night.

A health museum containing a 27’’½-foot intestine.