Morocco's Argania trees are infested with nut-hungry goats.

Hundreds of caves once used to store grains and animal feed.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

The most powerful waterfall in all of Europe.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This stunning concert hall has become a symbol of Iceland's national recovery.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A sulfuric martian landscape that looks far better than it smells.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

This elegant arc of a waterfall marks a religious turning point.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

A whimsical garden of outsider art in the Spanish countryside.

A modernist church in an ancient village.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A living art gallery painted on a canvas of Monterey pine trees.

A landscape decorated with enormous skull sculptures.

A fiery-red region of scooped out land still largely untouched by civilization, tourists or otherwise.

A medieval village holds a very modern hotel.