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

A star fort along the C&O Canal in western Maryland that protected America in three wars.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

Creating this diorama spurred naturalist Carl Akeley to begin advocating to protect the apes.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

Here be dragons.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

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

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

These flying foxes dangle from the trees around the library like fuzzy black fruit.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

The world's oldest continuously operating airport was founded by the Wright Brothers.

A relic of FDR's brief foray into utopian urban planning.

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

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

Bizarre Cavern.

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

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.

The taxidermy remains of the most popular pony in children's literature.