A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Trace the history of the nation’s early days at the site of America’s oldest stock exchange.

This overlooked courtyard and museum celebrate Benjamin Franklin's life and achievements.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

An Irish Memorial commemorating those who perished due to potato blight.

Alexander Hamilton’s creation caused quite a bit of controversy.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

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

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

The world’s first penitentiary, meant to be humane, drove men insane.

North Central Florida's largest flea market and a weekend roadtripper's dream.

A wall of chewing gum moonlights as collective art.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

Shoreline strewn with the remains of ghostly fallen trees.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

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.

A sculpture of a salmon swimming through a brick building.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This natural spring is the winter home to the largest gathering of manatees in the world.