Hut with supplies for shipwreck survivors.

This railroad tunnel was once the longest in Massachusetts.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

The thousands of shades on display — some toxic, others impossibly rare — are a library of more than just color.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

Come for the gun-toting hillbilly madman, stay for the ice-cream loving basketball bears.

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

One New Hampshire alleyway has become home to a public gallery of feline art.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

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

This roadside attraction attracts kids with dinosaurs before blindsiding them with geology.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

A fire station-turned-church-turned-museum dedicated to the work of seminal light artist Dan Flavin.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

This once-private estate is now a dreamy, meditative garden that's open to the public.

This classic steam-powered train takes tourists on a nostalgic trip around the Connecticut River Valley.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

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

An overgrown and abandoned tuberculosis ward resides in the midst of a quaint modern neighborhood.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

The exact whereabouts of this surreal cabinet of curiosities are rarely the same place twice.

Rumors of the occult haunt this upscale 1920s hotel.

The first ever diner included on the National Register of Historic Places is famous for its custard French toast.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.