A mysterious castle built as a monument to lost love.

Dozens of large steel sculptures fill this two-acre park outside a former blacksmith's studio.

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

Three playfully immersive mini golf courses let you travel alongside your ball to the cup at this facility, which has been around since the 1950s.

Three prestigious academic collections come together to create a world-class natural history museum.

Impossibly life-like natural history models created out of glass by a father and son.

One man’s hobby is another man’s world of metal wonders.

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

Former villa and estate of James Deering developed to preserve native tropical forests.

Enormous, fluffy dogs frolic around this museum dedicated to a legendary Saint Bernard.

This cave holds a surprisingly colorful variety of geological oddities.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

The world's longest known cave system.

A layered tribute to the work of mosaicist Isaiah Zagar.

Elevated freight railway turned wildly successful urban park.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The colonial home of Paul Revere during the American Revolution.

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

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

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

Two thousand artifacts from around the world collected by one woman who loved to travel.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The oldest continuously occupied public building in the United States.

Thousands of mounted insects, and some live ones, hide within an otherwise ordinary shopping mall.