The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

For over 70 years, this house was home to a pioneering Black artist and educator.

This American Civil War-era fort still stands near the border between Washington, D.C. and Maryland.

This large garden vase urn has nothing to do with the seventh U.S. President—it was designed by one landscape designer to honor another landscape designer's contributions to the National Mall.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

The first museum in the U.S. to address human rights issues in China.

This forgotten boat elevator was an engineering marvel in its heyday.

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

Art deco landmark on the outskirts of Washington, D.C.

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

A building shaped like the Army Corps of Engineers logo, because why not?

A much-maligned monument to teetotalism.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

Go take a picture with the inventor of the daguerreotype photographic process.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

The towering figures were created from the cemetery's fallen old-growth trees.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

The span is crooked and made from two older recycled bridges.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.