An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

A relic of FDR's brief foray into utopian urban planning.

A winding district gerrymandered into the shape of a mantis.

A Maryland museum dedicated to Black history, housed in a historic church.

FDR's Art Deco hospital tower was hopelessly inefficient.

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

Largest Roman Catholic church in North America.

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

It was once the base for a series of domestic terror attacks.

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

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The house where John Wilkes Booth conspired with his co-conspirators.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The national park was once a plantation estate.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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