The only structure left with direct ties to the Salem witchcraft trials of 1692.

Now home to hardy plants, these sand and gravel dunes once held back a massive prehistoric lake.

A monument to the groundbreaking environmentalist sits near the place where she first experienced the sea.

Grand architectural relics gain a new life in this Pennsylvania warehouse.

An underground blaze turned this village into a ghost town.

A 132-year-old telescope continues to keep watch over the night skies above Providence.

The largest battery in New England sits atop a Massachusetts mountain.

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

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

A toxic ghost town sitting atop a massive coal fire.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

Dozens of houses in the Adirondack Mountains are reminders of a literal "cottage industry" to cure people of a deadly disease.

The summit Roosevelt conquered before he descended to become The Chief.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

The world's largest piece of copyrighted artwork.

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

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

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

The oldest playground in America.

This supermarket is suspended 25 feet above an interstate highway.

America's "second most important bell" is a contentious spoil of the Civil War.

Once the largest gravity dam in the world.