A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Home to items never before seen by the public.

The U.S. Fish Commission’s effort to mass produce carp.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

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

The final resting place of a 19th-century gold prospector and convicted cannibal.

A memorial dedicated to the victims of the Columbine High School shootings.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

A downtown park built on top of unclaimed graves.

Taos Pueblo recipes, foraged ingredients, and outdoor ovens define the menu at this eatery.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

Victorian "Fancy Craft" Hair Wreaths and Relics.

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

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.