A unique geological area spiked with wind-carved rocks that resemble teepees.

Why have you never heard of the second most popular tourist site in New York?

This roadside dinosaur park offered up lumpy neon thunder lizards in the name of kitsch and education.

This charming English house was once the home of England's most famous poet.

This ancient theater was once the home of fierce gladiatorial battles.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

There’s a special club house at the top for the bell ringers.

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

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

The most accurate timepiece in the world.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

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

When it comes to handsignals (and colonialism) rock always beats scissors.

This historic boathouse was constructed using salvaged lumber from burned barns.

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

There’s a hidden military meme engraved on the World War II Memorial.

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

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

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

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.