The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

This building at the south end of the boardwalk was once home to the U.S. Life-Saving Service and the U.S. Coast Guard before being rescued itself.

This abandoned sea fort has become an accidental bird sanctuary.

Two flush headstones mark the only known graves to be embedded in an airport runway.

Exact replica of the ancient monument, but much, much lighter.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

St. Augustine's record-setting narrow street was designed to protect against pirates.

It's a pretty creepy lock-up.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Washington's iconic carousel has a nice piece of Civil Rights history.

This North Carolina store preserves a historic moment in America's movement for racial equality.

One of the oldest living oak trees in the Southeast.

The world-record holder for the longest bridge stretching continuously over water.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Rowdy rebels fortified this home during the first popular uprising in United States history.

Affectionately known as "Lord Bot," this historic statue has a cult social media following and rightly claims to be “the most metal inhabitant of the Wren Yard.”

This museum explores the grim reality of life in the earliest British colonies in America.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

An abandoned town is hidden in Great Smoky Mountains National Park.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.