On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

The last standing piece of a famous Honolulu landmark.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Elevated freight railway turned wildly successful urban park.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

A semi-scholarly approach to sex.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

A large boulder marks the place where the island of Manhattan was purportedly "sold" to the Dutch.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

Randy Senna's Fascination and retro arcade is home to the last Fascination game in New Jersey, and one of seven remaining as of 2021.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

This old-fashioned candy shop, ice cream parlor, and diner served as the setting for one of TV's most controversial series finales.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

The sun acts as a key that only fits this giant keyhole twice a year.

The highway's southernmost spot is a beloved local attraction.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.