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

Dubbed the "smallest church in America," this tiny sanctuary was a local grocer's dream come true.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

This beach-side arcade is believed to be the oldest penny arcade in America.

The birthplace of the man who patented the cotton gin and pioneered interchangeable parts.

This tree is a living witness to the beginning of the Civil Rights Movement.

Nine of the very few concrete ships ever made in the U.S. are beautifully decaying off a Virginia pier.

The land is home to swimming ponies and a legendary 18th-century treasure.

The dairy farm in upstate New York where nearly half a million people gathered for three days of peace and music in 1969.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

This mysterious artificial cave has long puzzled New Englanders.

A comic book store got the road by its shop officially renamed after Superman's girlfriend.

One man is on a singular quest to name an island after a famous hip-hop artist.

A tribute to the couples who brave long periods of separation during wartime.

Mary Rowlandson's kidnapping ordeal became one of the nation's first best-selling books.

This wooly sculpture supposedly marks the birthplace of a famous nursery rhyme, or not.

The haunting history of a little girl lost.

Surrounded by lonely toys, this Massachusetts gravestone marks the final resting place of six children who were murdered by poverty.

The pleasant woodland cemetery that has inspired more than its fair share of wild legends.

Monument on the spot where in 1778, Bathsheba Spooner had her husband Joshua killed and dumped down his own well.

This nature mural exists to protect the surrounding environment and its own canvas from destruction.