Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Every inch of this chapel is covered in craftsmanship from across the world.

Thousands of well-dressed mummies below a monastery.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

The spot where the namesake of the Douglas fir met his mysterious end on a Hawaiian volcano.

This unusual lava tube spouts seawater during high surf.

Get up close and personal with these majestic fish.

This legendary urban waterfall creates a dazzling display of rainbows.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

A controversial memorial at the place where Captain Cook met his violent end.

These ancient sacred grounds granted amnesty to those who managed to reach them.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

This black shoreline is made up of exploded lava particles.

A memorial to a goat culled during a foot and mouth disease outbreak guards a series of fantastical caves.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

A Neolithic passage tomb said to have sheltered two legendary Irish lovers.