A reproduction of earth's many biomes.

A volcanic fissure over two miles long and up to 70 feet deep.

A chapel built by Italian POWs during World War II tells a forgotten tale of the war on the home front.

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

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

See massive fossils that are over 200 million years old in northeastern Arizona.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

Locals purchased this abandoned quarry in order to make sure it continues to be overgrown.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

The eerie remnants of an ancient forest were hidden under the sand for centuries.

This mouldering abandoned mental hospital was once a center for progressive healing.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

This Pringle-shaped ledge makes for the perfect photo op.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

What may be America's largest classic video game arcade lurks inconspicuously in a Chicago suburb.

Jacksonville's highways rendered this century-old grammar school unusable.

Where school buses go to die and be reborn as whimsical works of art.