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

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

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

This lovely pocket park is one of the most under appreciated in D.C.

A haunting tribute to pioneering photographer Clover Adams.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

A computer bug so primitive it was an actual insect.

The house where John Wilkes Booth conspired with his co-conspirators.

Home to a vast and influential collection of Shakespeareana.

Largest Roman Catholic church in North America.

There's a crumbling old mansion inside the Smithsonian National Zoo.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

The most decorated dog of World War I is preserved in the Smithsonian.

The national park was once a plantation estate.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Home to items never before seen by the public.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.