One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

One of only two pod-shaped homes designed by Frank Lloyd Wright.

Hidden away in the city of Madison, Wisconsin is a nearly forgotten home that Frank Lloyd Wright built for a childhood friend.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Most famous work of one of Frank Lloyd Wright's sons.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

Dr Barnes' $25 billion private collection of art and arboretum.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

A park full of outsider art, created by college students studying outsider art.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

In which a local geological marvel becomes a quaint roadside attraction.

This park contains a number of standing stones meant to heal and inspire.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

The final resting place of the Hollywood star who came to a tragic end.

An ideal wedding spot that is almost too ideal.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

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