A Spiritualist house of worship where believers communicate with the dead in the spirit world.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

A historic arena where the Beatles played their first concert in the U.S.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

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

People escaping slavery may have hidden inside a corpse vault.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

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

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

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

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

Obscure Freemasons still live in D.C.’s largest private residence.

Also known as the Founding Church of Scientology.

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

The most accurate timepiece in the world.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

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

The ruins of this long-abandoned unsuccessful gold mine can still be found.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Every drop of D.C. tap water flows through this old waterworks.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

The first memorial dedicated solely to the Black troops who fought for the Union.