This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

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

A much-maligned monument to teetotalism.

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

This unassuming passageway played a key role in one of the most important events in U.S. history.

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

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

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

Once America's tallest structure, now a Baltimore landmark.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Mysterious rocks that ring musically when struck.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A Civil War Museum with some notable medical antiques.

A historic neighborhood church is reborn as a psychedelic arts collective.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The most decorated dog of World War I is preserved in the Smithsonian.