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

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

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

Perhaps the most scandalous statue of America's first president.

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

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

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

A celebrity from the late Cretaceous period.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

Home to a vast and influential collection of Shakespeareana.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The oldest continuously operating fish market in the United States.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

The national park was once a plantation estate.

There’s a hidden military meme engraved on the World War II Memorial.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

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

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.