A sprawling maze of used books piled from floor to ceiling.

Gutted airplanes slowly decay in a Florida field.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

This monument to the victims of a tragic explosion is said to turn and look at passing cars.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Endless rows of boxes of paper records line the hallways of the archaic federal facility where guns are traced.

Where hills of dirt conceal the burial ground of one of the most powerful ancient Native American societies.

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

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

Town not known for anything except its strange name.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

This stunning gothic ruin was a casualty of the Indiana steel industry crash.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

Remnants of a quarry company town still stand on the banks of the Wapsipinicon River.

Two hula hoops appeared on the tree after a storm, and the collection kept growing.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.

One of the largest and oldest caravansaries in Persia.

Years of neglect and nature took a toll on this 19th-century lighthouse.

These molds for fiberglass statues have formed an eerie, accidental sculpture park.

A roadside spring pooling in an old bathtub where anyone can stop and sip.

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