A monument celebrating the idea of reaching inaccessible places.

This tiny home was originally a narrow alleyway.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

The museum chronicling a treasure hunter's dream, fulfilled.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

A unique collection of diving equipment spanning antiquity to the present day.

Electrical pylon in the shape of Disney's beloved mouse.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A haunted hill that supposedly defied gravity.