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

A computer bug so primitive it was an actual insect.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

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

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

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

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

This grand gothic brewery has been pumping out suds for over a hundred years.

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

One of the largest collections of Catalan literature and cultural materials outside of Spain, created by a community of 1960s expats.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

This suburban house is made of dirt, and almost sparked a revolution in home construction.