Recorded as the first person buried in Arlington Cemetery.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

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

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

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

A spectacular tribute to statesman and philanthropist Andrew Mellon.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

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

A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

This hidden treasure provides a charming access point along the south side of Baker Park.

According to local history, this cast-iron canine was nearly melted down for bullets during the Civil War.

A quick journey through the history of Annapolis.

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

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

This former fire tower found new life as a communications hub complete with a scenic overlook.

An overlooked memorial honoring the local Washington residents who died in World War I.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The only runway directly into the magic kingdom has been closed since 1972, but it still sings to you if you drive fast enough.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

A home that witnessed Civil War combat on the Sunken Road has the battle scars to prove it.