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

Dr Barnes' $25 billion private collection of art and arboretum.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

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

A bygone village occupation lives on via this quaint public chalkboard.

Perhaps the most scandalous statue of America's first president.

An obelisk marks the farmhouse where the founder of Mormonism was born.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

This museum remembers the tough Mormon trek across America through an intriguing array of artifacts.

Visitors to this library are in for a real-world education in modernist architecture.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

A centuries-old church stands as a testament to Boston's "father of architecture."

"Mock all and sundry things, but leave the saints alone."

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

The most photographed house in Maine looks good enough to eat.

Located just behind a quiet residential neighborhood, this is ground zero for the Salem witchcraft hysteria of 1692.

Its unique collection details the history of the state's svelte railroads.

A gas station and a state sign commemorating the most famous claims of extraterrestrial abduction.

According to the experts at the Guinness World's Record office, this is the longest candy counter in the world.

One New Hampshire alleyway has become home to a public gallery of feline art.

The 92-foot-tall structure is based on the aircraft that carried the first Americans into space.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

A building so large that it has its own weather.