This massive blockhead sculpture hides an entire library.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

The mansion home of author Edith Wharton.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

A recreated sign from the movie Jumanji has become a makeshift tribute to the film's late star.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

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

An eccentric inventor's castle home with its own indoor weather system.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

America's oldest archaeological site or a muddled case of wishful thinking.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."