This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Explore the dark underground corridors of this graffiti-covered former military fortification.

Once the largest attraction in Rhode Island, this former amusement park is now a gorgeous coastal state park.

This historic psychiatric hospital is haunted by its chilling past.

Former private property that was hidden up a trail in the woods with thousands of bright yellow daffodils.

Some big-name visitors have patronized this small-town library named for an oil man's daughter.

The sea urchin sculpture is an unusual commemoration of a New England town's seafaring history.

The New Bedford Whaling Museum in Massachusetts displays what it calls the world's largest ship model.

This historic vessel on display in Massachusetts made a dozen scientific expeditions into the Arctic.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

Amazingly, this old machine within the Resorts Casino still functions.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A unique seaside cave where Aleister Crowley faked his own death.

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

This folk art dinosaur was almost pushed to extinction due to lack of a building permit.

A pair of black granite tails dive into a sea of grass in landlocked Vermont.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Three wooden middle fingers raised in protest.

A giant telephone commemorates the last "crank" call ever made in the U.S.

Turns out you can see the world without ever leaving Maine.

An underground blaze turned this village into a ghost town.

A wonderous place devoted to art and metal.

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

One of the first commercially successful anthracite-powered iron-making operations in North America.