This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

The most confusing clock in New York.

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

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Elevated freight railway turned wildly successful urban park.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This giant disembodied horse head seems to balance impossibly on its nose.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

A unusual sanctuary for abused and exotic animals in South Jersey.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.