A wall of chewing gum moonlights as collective art.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

A walk through the historic city center, under the streets of Seattle.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A historic ruin just 20 feet away from a busy highway onramp.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The site of the climactic scene from the classic horror film is now a historic landmark.

Every drop of D.C. tap water flows through this old waterworks.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

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

Bizarre Cavern.

A Civil War Museum with some notable medical antiques.