This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

The roadway bend where highway painters practice their craft looks like expressionist art.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

This grisly headstone doesn’t seem to be resting in peace.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

The narrowest house in America is seven feet of pure spite.

A remote horde of architectural treasures fit for Indiana Jones.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

A clone of a cloned tree that was so important it allegedly had its own guards.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

These colossal desert barcodes have been fine-tuning spy satellites for decades.

The Forest Service's surprisingly sophisticated collection of wildfire prevention art features America's most beloved bear.

Where pardoned turkeys once spent their all-too-brief final days.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

A relic of FDR's brief foray into utopian urban planning.

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

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.