This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Perhaps the most spectacular grotto along the Algarve coastline.

Abandoned Italianate architecture on the coast of Maine.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This roadside wonder is as mysterious as it is beloved.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

This cemetery is home to numerous granite headstones that are works of art unto themselves.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Amazing views of Long Island Sound can be seen from this mountaintop tower.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This railroad tunnel was once the longest in Massachusetts.

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.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

Three acres of mythology-inspired sculptures are visible from the highway.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

Who knew the Devil's domain was a hot spot for tubing?

A mysterious collection of stones stand outside a small New England town.

A former copper mine which became a truly unsuccessful prison.