The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

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

An eerie, decaying ghost town destined to fade into the forest.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

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

Even in death, he's still your huckleberry.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

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

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

A museum dedicated to exhibiting remarkable outsider art.

Eighteen miniature death-scene dioramas.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

The most accurate timepiece in the world.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

An astounding collection of medical specimens, including bits of President Lincoln.