Mine your own precious stones.

The U.S. Army's giant warehouse of war art includes Hitler’s watercolors and Norman Rockwell oil paintings.

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The only place for a truly presidential dram.

This sprawling museum holds one man's giant collection of real tanks.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

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

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

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

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

An overgrown garden stands as a grim marker of an unrealized dream.

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

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

The resting place of a Civil War celebrity's amputated limb.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

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

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Outsider art meets paleontology at this roadside reptile repository.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.