This railroad tunnel was once the longest in Massachusetts.

Once the largest gravity dam in the world.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

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

A small Second Empire-style building is one of only seven remaining lighthouses on the Hudson River.

The mansion home of author Edith Wharton.

A humble air museum located in an original World War II aircraft factory.

The location of the pie company that gave a classic toy its name is now a parking lot.

This mouldering abandoned mental hospital was once a center for progressive healing.

An eccentric inventor's castle home with its own indoor weather system.

New Hampshire's most beloved war hero lived out his retirement in this peaceful homestead.

A war memorial that appears to ascend from its forested setting.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

Two artist-designed restrooms are part of the collection at the Smith College Museum of Art.

Dozens of bronze sculptures are woven into the landscape along this trail.

This curious and colorful space invites visitors to delve into the hidden and often mind-boggling world of caterpillars.

Stumps of an Ice Age forest, visible only at low tide.

One of 100 “Whaling Wall" murals painted in 13 different countries by a renowned marine life artist.

This college campus garden is home to generations of award winning flowers.

Herman Melville wrote 'Moby Dick' in this landmark 18th-century house surrounded by farmland.

Stay at this storybook estate, featuring Sir Henry Hudson Kitson's masterpiece "Gingerbread House."

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

An abandoned 146-acre summer resort slowly being reclaimed by nature.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.