The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

The ancient tomb acts as a calendar that keeps perfect time.

New York City's only preserved family home from the 19th century.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

This uninhabited island in Maine is home to various works of art left by visitors over the years.

Final resting place of the actress famed for her roles in Dark Shadows and Dario Argento's Suspiria.

This last stalwart of the now-forgotten feminist restaurant movement has been serving food in an activist atmosphere since 1977.

A miniature village lies nearly forgotten in the forest by the side of a major highway.

A parade of antique steeds offers a quirky ride through history.

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

Connecticut grave of the woman responsible for the Winchester Mystery House in California.

An abandoned Depression-era zoo hidden just off the highway.

An iconic steel and chrome diner from the 1940s left empty for nearly 20 years is in danger of being demolished.

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

A wunderkammer hidden on the top floor of the Hartford statehouse.

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

This small-town Connecticut restaurant gives each diner a free book from its vast library.

The intriguing personal collection of a professional demon-chaser.

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

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.