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

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

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

This pun was simply waiting to come to life, and one defense contractor made it so.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

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.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

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

A priceless collection of the Nation's cryptologic history.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Step inside Lucy, the world's largest "elephant."

The first American department store, and home to the largest operating musical instrument in the world.

A bygone village occupation lives on via this quaint public chalkboard.

Site of the graveyard vine believed to be a curse on a family from the 1800s.