Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

Crumbling Kennedys and a decaying Tecumseh are just some of the haunting remains of one man's cement art trail.

The first full-scale tunnel built in America is short but scenic.

An oversized metal construction of Billy Tripp's moods going through life.

Live long and prosper in Tennessee.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

This former Mormon settlement is reemerging from the receding waters of Lake Mead.

The drama of nature in full effect in this Nevada State Park.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

Enormous lake at the bottom of a unique cave system.

The secret city built by the Manhattan Project.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

Beautiful steampunk ghosts of early Massachusetts.

A haunted hill that supposedly defied gravity.

Florida castle built with aluminum printing plates.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

The Burnside Fountain and its questionable interpretation.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

This historic Boston building has gone from personal estate to porn theater and back again.

This Italianate Villa-style castle is pretty to look at, just keep off the private property.

This relatively recently abandoned brewery is a tragic reminder of the continuing effects of Hurricane Katrina.