Spain's stunning solar energy plant.

Village situated on a narrow volcanic escarpment.

Rare karst landscape eroded from a flat seabed.

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

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

A Spanish town built into the cliffs.

Moorish signal station on a stratgic rocky outcrop.

This surreal-looking tree pruned more than 1,000 years ago is still producing olives for oil.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

This crumbling Portuguese ruin overlooks the populace it once ruled.

A neolithic tomb converted into a tiny chapel.

The tallest tower in Cáceres's Old Town.

Fragments of human bones are embedded in the walls of this quaint alley.

A strange anthropomorphic stele with a mysterious inscription that has never been deciphered.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

"Alleys of Stone" form natural mazes in Spanish natural park.

Walls of stone rise up from sinkholes caused by underwater erosion.

Geological storytelling.