A mysterious echo seems to defy the laws of acoustics.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

One of America's first spies started out as a teacher in this little red one-room schoolhouse.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

This small-town pizzeria won the Hollywood lottery.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

One man’s hobby is another man’s world of metal wonders.

The massive machine creates cracking displays of indoor lightning.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

Ice cream stand, snack bar, and time capsule of milk conveyance.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

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

An enormous, inside-out glass globe built in 1935.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

An abandoned stretch of highway, deteriorating next to the operational one.

A toxic ghost town sitting atop a massive coal fire.

A natural gas leak provides a flickering flame beneath a waterfall.