Brain collection and database that narrows the gap between man and animal.

An astounding collection of medical specimens, including bits of President Lincoln.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

The rogue roots are gradually consuming some of the historic marble grave markers.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

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

Home to items never before seen by the public.

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

A secret greenspace hides atop a Capitol parking garage.

This nine-story building is the oldest standing skyscraper in D.C.

The first memorial dedicated solely to the Black troops who fought for the Union.

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

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

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

The most accurate timepiece in the world.

Corn-inthian columns with a uniquely American take on neoclassical architecture.