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

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

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

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

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.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

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

The "lovely red Vega" of the legendary record-settling pilot.

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

The privately owned cemetery that holds room for Washington's finest when they step down from life.

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

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.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

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

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The national park was once a plantation estate.

A nostalgic bibliographic gem.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.