This jail which was in service for over a century is now open for curious visitors.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The final resting place of the poets Shelley and Keats.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Architectural monsters are devouring this palace's every door and window.

This strangely amalgamated museum explores the history of the Timex clock company as well as archaeology.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

Fossilized sea bottom and lime quarry.

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

An outlandish shoe shaped house built by an eccentric millionaire.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

A unique sculpture park that specializes in the huge and bizarre.

This elaborate towering structure was once famed for its revolutionary height.

An abandoned stretch of highway, deteriorating next to the operational one.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

One of the oldest of its kind.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

Yo, Adrian!