The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

A floating museum that was sunk by a flood and left to rot in the tides.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

An abandoned concrete jungle surrounded by a lush park.

A remarkably opulent mansion with a tragic history.

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

One of the largest Masonic temples in the world, created at the height of the oil boom in ostentatious style.

Along the historic Mother Road is an old gas station with a secret counterfeiting past.

European castle ruins in an American state park are actually the product of death and grief.

This historic bridge has weathered fires and floods and still stands, now abandoned, where it has stood since 1874.

An abandoned early-20th-century boomtown sits within the Calico Rock city limits.

The final remnant of the Arkansas zinc industry is this historically protected ghost town.

The Ozarks' strangest dwelling.

This former mining town was named the most toxic town in America.

These massive mitts are made of 30 tons of devotional bronze.

An acoustic anomaly with a mysterious cause.

This abandoned, windowless concrete block is one of the strangest buildings in Tulsa.

Once known as the Illinois Asylum for the Incurable Insane.

The 606 is a decade in the making.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

Cold War missile launch site which has been converted to a public park.