Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

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

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

The highest point in Virginia can only be reached by passing through ponies and flowers.

Outsider art meets paleontology at this roadside reptile repository.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

One of the only memorials dedicated to journalists who died in combat.

Tiny observatory made big contributions to the study of the Earth's motion.

Once America's tallest structure, now a Baltimore landmark.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

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

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

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

This abandoned sea fort has become an accidental bird sanctuary.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The land is home to swimming ponies and a legendary 18th-century treasure.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.