This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The first declared National Monument in the United States.

Native Americans built this circle of stones, which was used to predict astronomical events.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Curios, scientific antiques, oddities for sale.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

This underfoot portrait is the work of a disgruntled painter inspired by a tragic poem.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.