The show pony of cave systems, Fantastic Caverns manages to live up to its name.

Curious cave that stays a cool 56 degrees all year long.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Less a museum than a bizarre fantasy world created by artists and engineers.

European castle ruins in an American state park are actually the product of death and grief.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Erosion and time have created a naturally-formed water park.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This decrepit abandoned building is made all the more eerie by its dark history.

Final resting place of a pioneering scurvy researcher.

A remnant of the 19th-century dream to discourage people from drinking booze by offering them water.

Funded entirely by volunteers and donors this military memorial features a tank with a comedy line on its barrel.

A freighter full of exotic animals ends a harrowing voyage impaled on uncharted rocks in the Boston Harbor.

A man in a plane delivers Christmas packages to lighthouses.

Every December the Wannalancit Mills lights a Christmas Tree over the old mill's smokestack.

Second largest wastewater treatment plant in the country.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

A memorial sculpture to heath hens stands on the spot where the last heath hen, Booming Ben, was last seen.

A school used as a model for public education across the country.

These impressively detailed battle scenes depict the violence and tragedy of war in miniature.

The monumental steeple on Amherst College's campus has no church attached to it.

On a side street near the interstate is the building where the famous anarchist once owned an ice cream parlor.

This supermarket is suspended 25 feet above an interstate highway.