Hidden for 165 years inside a building designed by Thomas Jefferson are the remains of what may be America's first educational chemistry lab.

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

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

This statue is dedicated to Grace Sherwood, the last person in Virginia to be convicted of being a witch.

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 first federal monument.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

Inspired by a foil-wrapped potato, (seriously) the Markel Building has been deemed one of the 10 ugliest buildings in the world.

One street divides a single town that stands in two U.S. states.

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

At 207 feet, one of the world's longest continuous escalators.

This historic mansion was built as a symbol of love between a husband and wife.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

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