This tiny patch of arid sand sits in one of the greenest states in the United States.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

This haunting monument honors the victims of 9/11.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The "Seinfeld" diner.

The site of Paul Revere's historic two lantern warning.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

This rail trail culminates in a three-mile land bridge only accessible to cyclists and pedestrians.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A mountain pass used by Prohibition-era bootleggers to facilitate traffic into and out of Canada from Vermont.

A gorilla holding a VW Beetle isn't what you'd expect in rural Vermont.

Tracing a path of more than four miles around a frozen lake, this is the longest skate trail in the United States.

Vermont's hills are alive with the sound of music at this historic hotel.

According to folklore, Vermont's slanted windows were installed to keep witches from flying into the house.

Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

Monasteries on rock pillars, once accessible only by frayed ropes.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.