A star fort along the C&O Canal in western Maryland that protected America in three wars.

An astounding collection of medical specimens, including bits of President Lincoln.

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

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

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

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

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

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

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

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

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

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

There’s a special club house at the top for the bell ringers.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A haunting tribute to pioneering photographer Clover Adams.

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

FDR's Art Deco hospital tower was hopelessly inefficient.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.