The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The highest point in Washington state is a volcano covered in glaciers.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

Easter in Westminster may be the only time and place to behold Edgar Allen Poe made entirely of Marshmallow Peeps.

The first declared National Monument in the United States.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

This might just be the TARDIS of bookstores.

America's first serial killer rests in anonymity.

A completely round house designed for the Atomic Age.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

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

A mammoth pair of Civil War artillery guns abandoned out in the forest.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The rogue roots are gradually consuming some of the historic marble grave markers.

This Virginia railway overpass is said to be haunted by a serial killer in a rabbit costume.