During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A derelict bit of transportation infrastructure hidden in the woods.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The United States Capitol's former columns still stand.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

There's nothing shrimpy about the world's largest artificial prawn.

These naturally occurring but rare geological formations are each about the size of a small house.

Created as a coal reserve, it is today a natural park with stunning wildflowers, ancient marine fossils, and remnants of a 19th century mine.

Carved panels tell the complete history of the harsh Central Highlands region.

A monument to a working class martyr.

On Keriri/Hammond Island, a marker shares the story of an imprisoned woman and the island she saved and that eventually saved her—in the fictional world of Kcymaerxthaere.

Fiberglas monument to Moonbi's poultry industry.

Past Blinman, past the end of the asphalt, in the majesty of the Flinders Ranges, you will come upon three stone markers by the road.