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

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

This overlooked museum houses an amazing collection of rare, antique typewriters.

The world's largest indoor go-kart racetrack is hiding in Connecticut.

The headquarters of the famous Yale society.

This "thrice-cursed" island is allegedly home to Captain Kidd's lost treasure.

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

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

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

The kind of mixed-up place that drives archaeologists crazy.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

The intriguing personal collection of a professional demon-chaser.

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

In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

One man's lifelong obsession with death.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

One of the world's largest model railroads is a mind-boggling achievement.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.