Millions of numbers carved in glass represent the tattoos forced upon victims.

This supermarket is suspended 25 feet above an interstate highway.

Memorial to a beloved puppeteer as well as all street performers.

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

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

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

Overgrown ruins of a turn of the century island fort that sees very few visitors.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

It's not a typo, now say it five times fast!

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

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

A Harvard-area eatery preserves the uncovered tiles of its century-old predecessor.

One man's psychedelic fence is painted with his cacophonous folk art musings on the world.

Bouncing, delightful, mechanical art at the MIT Museum.