The remnants of an early American attempt at missile defense.

An abandoned relic of the city's failed experiment with below ground transit.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

The bones of an old zoo crumbling in the shadow of a new one.

If astronomy had a ghost, it would look like this observatory.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

This abandoned 19th century orphanage started as a boarding school for children of Civil War veterans.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

This empty Detroit high school was too expensive to maintain or destroy.

This abandoned prison castle has become an imposing gallery of graffiti art.

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

This abandoned bootleg attraction was built to cash in on the popularity of classic TV show, F Troop.

This once bustling boomtown hotel is now the hottest spot in Nevada for ghost hunters.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

One man's ambition created this psychedelic log home.

The remains of a World War II munitions factory still haunt the fields of this Twin Cities suburb.

This ghost town was once a cult-like religious utopian settlement.

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

See just what life was like in a 19th-century prospecting town.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.