This fantastical waterfall is hidden in a cave located in a cracked cliff.

Medicinal spa created with the discharge from a geothermal energy plant.

The oldest place in Hartford is a cemetery with thousands of bodies stacked beneath the grass.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

A towering cemetery monument honors a man who threatened to expose the Freemasons and paid with his life.

A mysterious echo seems to defy the laws of acoustics.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

The Hudson River School comes alive at this palatial estate.

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

Why have you never heard of the second most popular tourist site in New York?

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

This roadside dinosaur park offered up lumpy neon thunder lizards in the name of kitsch and education.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Resonating tubes make music from highway overpass.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Collapsing castle on the Hudson river was once the storage site of military surplus business.