This stained glass window designed by Tiffany Studios is hidden behind the circulation desk of a public library.

This relic of 19th-century infrastructure is one of the few remaining coal gas storage tanks in the U.S.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

These craggy limestone outcrops offer a glimpse at a unique piece of Florida geology.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

These formal gardens were designed to be admired from the vantage point of the castle.

The heads of two giant mythological water horses honor Scotland's horselord past.

This Neolithic-era complex boasts standing stones, a cairn, and the only henge in Western Scotland.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

This beautiful Miami garden was designed as a laboratory for tropical plants.

A time capsule of Floridian history fights to survive on the banks of Chokoloskee Bay.

The world's most famous donkey lives in this pen.

Reforestation in action is the main attraction in this abandoned quarry.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

When Motown musicians came to Nashville in the 1960s they stayed at this historic record-pressing company because hotels wouldn't host them.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

A key producer of charcoal iron in the early 1800s, the structure still stands today.

Home to items never before seen by the public.

Avoid gangster interaction while window-shopping.

The very first subway station in New York City is beautiful, decked out in chandeliers, and ... abandoned?

Elevated freight railway turned wildly successful urban park.

An artist's cute bronze subway sculptures belie his violent artistic past.