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

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

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

Largest Roman Catholic church in North America.

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

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

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

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

The most accurate timepiece in the world.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

When it opened during the final years of the embargo, all the drinks and cigars were free.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.

Also known as the Founding Church of Scientology.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

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

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

This poor little statue is the most vandalized memorial in Washington.