If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

A flooded Mexican cave that hides a river beneath the water.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

This erect, phallic geological spire wasn't always named so domestically.

Roaming bison and a spectacular view at the highest point in Nebraska.

An experimental, automotive replica of Stonehenge.

The headquarters of the prestigious World Food Prize celebrates the heroes in the fight against hunger, has no cafeteria.

Millions of dollars worth of sculpture decorate this Iowa city center.

This simple home was the beginning of a long journey for the iconic Western film star.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

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

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

These pretty kitties killed and ate as many as 135 railway workers.

Home to the deepest rift anywhere on Earth.

Experience a charming 1930s version of "infotainment."

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

Jail from the 19th century that was built by inmates.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Marta Becket's hand-painted theater in the desert.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

There's nothing creepier than a cemetery next to a clown motel.