The romance of early commercial flight still fills this Art Deco destination.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

The last of Fairfax County's one-room schoolhouses.

Journey inside the bowels of this sperm whale sculpture.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The "Seinfeld" diner.

Rumors persist that a bottle of whiskey is sealed within this Demijohn-shaped adornment.

Legend says this sacred tree was a gift from goddess Athena.

Time travel with sweets across history at this research-based candy store.

The hallucinogenic center of the ancient world.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Bizarre Cavern.

One of the only memorials dedicated to journalists who died in combat.

The whole world in one water tank.

Tiny observatory made big contributions to the study of the Earth's motion.

Built by the patriotic residents of Boonsboro in a single day.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

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

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.