Deep scars on the earth left by the Ice Age.

This restaurant proudly displays bread signed by the 39th president.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The 28,000-year-old specimen is remarkably intact.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

An overlooked memorial honoring the local Washington residents who died in World War I.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

Washington's iconic carousel has a nice piece of Civil Rights history.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

These once-beautiful historic graveyards are set against the barren Virginia City hills.

Twelve plaster figures inspired by da Vinci's famed painting haunt the desert landscape above a real-life ghost town.

This record-setting hydraulic dam in the Montana badlands was one of FDR's most ambitious public works.

The only road through the heart of Glacier National Park.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.