Bison, America's national mammal, are staging a slow comeback in Ohio's prairie parkland.

Rare recess caves fill this unbelievably beautiful Ohio park.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

Walk the whole Mississippi River!

The largest ancient burial mound in Ohio.

An office built to look like a giant basket.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

An unassuming 13-acre park is home to over 12,000 roses.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

The largest earthwork effigy in the world.

A battle between nature and architecture in the Cambodian jungle.

Less a museum than a bizarre fantasy world created by artists and engineers.

The world's longest known cave system.

A lush green oasis in the middle of Chicago.

Just outside the Ohio Supreme Court sits a testament to justice.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.