A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

An Orlando museum houses the world’s most comprehensive collection of work by Louis Comfort Tiffany.

Approximately 65,000 gallons of crystal clear water pour out of this headspring every minute.

Former wax museum from the 1960s, home to many wax U.S. Presidents and the famous White House miniature.

An icon among Florida's pre-Disney tourist attractions, just west of Orlando.

Part of a highway network meant to connect Miami to Montreal, this 10-mile stretch of road made from red bricks is still around 100 years later.

The filming location of a shark attack in Steven Spielberg's famous shark movie.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

137 graves holding New England's earliest residents.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

The world's second largest single-dish radio telescope, once used to contact E.T.

This spooky road cut through a mound of ancient coral might be haunted by a witch.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

This beautiful site is where the first transatlantic telegraph was sent from.

Who knew the Devil's domain was a hot spot for tubing?

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

Elvis's own personal tropical hideaway.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.