A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

Priceless space junk on display in front of a local Dairy Queen.

Where the oil industry began.

Its unique collection details the history of the state's svelte railroads.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

The building that inspired Shirley Jackson's "The Haunting of Hill House."

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

A wall of chewing gum moonlights as collective art.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A maritime museum holding the remains of Blackbeard's pirate ship.

Burial site more than 300 years old.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.