A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

The rogue roots are gradually consuming some of the historic marble grave markers.

The National Park Service’s best-kept secret with views that rival any in D.C.

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

A historic neighborhood church is reborn as a psychedelic arts collective.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

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

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

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

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A museum dedicated to exhibiting remarkable outsider art.

A historic lighthouse steeped in rumors of ghost and pirate stories.

The best way to get a sneak peek at the movies.

New York's oldest and possibly grandest keeper of books.

This hidden library of physiological ephemera contains centuries worth of knowledge on the vim and viscera of the human body.

The oldest continuously operating fish market in the United States.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A 131-year-old wunderkammer of Texas history.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.