Home of the Daffodil Festival, Castle Craig, and a ghostly hound.

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

The world's largest public collection of PEZ memorabilia.

Ride the subways of yesteryear.

This sprawling 18th-century cemetery features unique and beautiful gravestones, including one shaped like a tree.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

The cave where two British judges hid in exile after sentencing the king to death.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

A downtown park built on top of unclaimed graves.

One of the few surviving Panama Canal steam shovels stands outside a tiny Colorado mining museum.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

The burial grounds of a secret society includes fences topped with fake Tesla balls.

A Rocky Mountain city provides a happy ending for a pinto pony and his Brobdingnagian red chair.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

This house was the subject of an Edward Hopper painting, which in turn helped inspire the design of the Bates house in Alfred Hitchcock's 'Psycho.'

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.