This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

A taste of Middle Earth, in the middle of the Bayou City.

A medieval castle in the middle of rural Texas.

The Grand Canyon of Texas.

Three hundred illuminated pillars form an “artificial forest” in Medellín.

Legends surround this jagged rock formation in the New Mexico desert.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

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

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

This remote island in Iowa was abandoned after being devastated by flood.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

A unique gallery chronicles the losers of American presidential history.

14th century Norse artifacts in Northwestern Minnesota could have proved a Viking landing before Columbus.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

Half of a waterfall goes into the river while the other half seems to disappear.

A cave 150 feet beneath Kansas City is the perfect climate for growing 10,000 delicate orchids.

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

Undone by Prohibition, this abandoned brewery-turned-flour mill is now ready for its third act.

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

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

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

Curious rock formations in a tiny Kansas state park.