Alaska Natives have lived on this tiny isolated island in the Bering Strait for over 5,000 years.

This ghostly Alaska village still clings to a steep cliffside despite having been abandoned for over 50 years.

America's smallest "national forest" has only 33 trees.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

The birthplace of both the Atomic Age and Godzilla, and the namesake of the bathing suit.

This former Cold War missile control site played an important role in the creation of GPS.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

The birthplace of the Herndon Gas Company.

Now a pedestrian bridge, this was once part of a narrow-gauge railroad that ran along the east coast of Kauai.

Fascination continues to surround one of history's most infamous shipwrecks.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

This abandoned lighthouse looks like a rusting oil rig, but has managed to survive a number of storms.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

The site of one of Japan's very few American occupations during World War II still holds the relics of a roundly disastrous campaign.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.

A petite castle folly in the English countryside.

A portal into the bricked up canal that runs through the heart of Washington D.C.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

100 years later, they're still down there.

This forgotten boat elevator was an engineering marvel in its heyday.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.