A winding path built in secret on the edge of the continent.

An abandoned lot littered with concrete debris was once the home of the world's first female railroad president.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

The famous animator's private station house and man-cave was the birthplace of imagineering.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

The ruins of Vancouver's abandoned heritage railway.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

One of Europe's largest supercomputers is housed inside of a disused chapel.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

A church of bones, decorated with 40,000 human skeletons.

Two stunning 17th-century libraries and a cabinet of curiosities.

A mocking tribute to the past and modern leadership of Prague.