This 1967 experiment in modular architecture was designed to be a new model for urban living.

This expansive bridge in the Canadian wilderness was originally just built for friends.

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

Believed to be the country's tallest waterfall, the Njupeskär is actually much smaller.

A tombstone on the grounds of the royal castle marks the burial site of a Swedish king's beloved dog.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

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

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

One of the only single-person private gravesites in New York City.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

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.

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

Little Red Lighthouse under the George Washington Bridge.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

The legendary court where emerging basketball players gain their street cred.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.