The oldest continuously operating fish market in the United States.

The national park was once a plantation estate.

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

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

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

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

The United States Capitol's former columns still stand.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

Both funky and traditional, it's the oldest of its kind in Indiana.

A medical facility that has been kept frozen in time.

At a mile long, the Fort Madison Bridge is the largest double-decker swing-span bridge in the world.

This hand-carved wooden carousel in the Story City North Park was built in 1913.

This massive railroad spike celebrates the 1939 premiere of the movie “Union Pacific.”

One of just a few cities in the world to base their center of government on an island. Others: Paris and Osaka.

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

The remains of a Rockefeller's lush Italianate estate hidden in the underbrush on the coast of Lake Michigan.

You were once able to challenge a chicken to tic-tac-toe at this park, which is now converted into the Aikman Wildlife Adventure.

One of the most powerful computers in the world can be visited by anyone who wants to experience more computing than they can handle.

Urban explorers embraced America's now demolished first suburban mall, south of Chicago.

An unassuming store hides relics of its former life as the jazz club that hosted some of the best black performers of the 1920s and '30s.

Hot Doug's "Hot Dog" Stand.

A theater sits abandoned on Roosevelt Road, once majestic in splendor, now majestic in decay.