An abandoned convention space that has been left to the homeless and the radical.

On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

A key producer of charcoal iron in the early 1800s, the structure still stands today.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

Walk the same tracks that once ferried Gilded Age aristocrats to their vacation destinations.

Once a popular hangout spot this huge mall was left to ruin after economic crash.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

What was once the largest NFL stadium.

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

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

One of the few surviving examples of the first lock and dam system built on the Ohio River.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.