This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A bit of retro transportation flair preserved in the world's largest department store.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

The "Seinfeld" diner.

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.

The building was originally a gas station built to resemble a Japanese tea house.

The Bong-area park police have asked visitors to please, stop stealing the signs.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

The birthplace of a titan of American cinema.

A large circus museum with summer performances.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

One of Frank Lloyd Wright's final works was this UFO church.

A theme park attraction designed to turn your children into LARPers.

A restaurant and lodge in northern Wisconsin which served as a clandestine hideout for John Dillinger and featured one of the most famous botched FBI raids in history.

This supper-club-turned-concert-venue still serves drinks at its original rotating bar.

Behind a modern brick exterior lies the oldest continuously-operating lunch-car diner in the United States.

More than 5,000 contemporary and "historic" mustards from around the world.

Wisconsin's most celebrated export gets the royal treatment on I-94.

This cave holds a surprisingly colorful variety of geological oddities.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.