These beautiful garden buildings are among the oldest surviving greenhouses in the United States.

A steampunk wonderland that preserves America's history of industrial innovation.

This supermarket is suspended 25 feet above an interstate highway.

The hill that gave the Massachusett tribe, and later the state, its name.

This small shop walked so America could run on Dunkin'.

The nation's second-ever First Lady urged the founding fathers to "remember the ladies."

America’s oldest community theater, this Boston club has been in operation since 1877.

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

One of the now-less-hidden floral gems of the "Emerald Necklace."

This hotel was the site of major events in sports and radio history. It was also used as a detention center during World War II.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

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

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

The early 20th-century home features cutting-edge technology of the day, such as ammonia refrigeration and needle showers.

Former laboratory of radical psychiatrist Wilhelm Reich.

This candy-striped tower is the farthest east you can go in the United States.

A quarter mile off the coastal tip of Maine you'll find the "Beloved Island" of Franklin Delano Roosevelt.

The 32nd president's sprawling cottage sits on an island enclave jointly managed by the U.S. and Canada.

Iconic rock formations that allow for exploration during high or low tide.

A mysterious spot where the laws of gravity seem not to apply.

Twice a day, the water of the Petitcodiac River flows upstream in a surfable wave.