A tribute to the pop culture icon overlooks this Washington D.C. intersection.

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

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

A secret greenspace hides atop a Capitol parking garage.

This taxidermy horse was a Civil War hero.

A line of blue paint marks the route of the inaugural parade.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The most accurate timepiece in the world.

Decades before the scandal, this staircase on the river was a literal "water gate."

This lovely pocket park is one of the most under appreciated in D.C.

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

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

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

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

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

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

The abandoned coal loading dock is a canvas for unsanctioned art.

A hidden alley in urban Baltimore is a haven for graffiti artists.

Baltimore's first skyscraper may be home to the inspiration behind pulp fiction's most celebrated bird.