This razorback ridgeline has doubled as a scenic drive since the early 1900s.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

An abandoned asylum where patients have been forgotten but their possessions remain.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

Steepest flood safety railway in the entire world.

There aren't too many operational funiculars around, but Pittsburgh has two!

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

A monument in a town outside of Boston celebrates the visits of Edgar Allan Poe.

Supposed Massachusetts Grave of a pre-Columbus Knight Templar.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.

This unassuming Massachusetts residence was built with a trap door to hide escapees on the Underground Railroad.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

America's "second most important bell" is a contentious spoil of the Civil War.

All that remains of the Whittall mansion are the ruins of the formal garden and its pergola, dedicated to the late Matthew J. Whittall by his widow.