Neo-cave art on the macro scale.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

The house that birthed The Old Man and The Sea is now a museum devoted to the old man who wrote it.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Once the home of a hermetic monk, this cave now houses a small church.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This impressive clifftop temple was once at the center of an international custody dispute.

Hoax, mistake, or evidence of dinosaurs in human times?

A battle between nature and architecture in the Cambodian jungle.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

Bridge that died in war and was resurected.

A sanctuary for sickly, stray, or wounded donkeys.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

A massive underwater sinkhole made famous by Jacques Cousteau.

The runoff from these fiery cliffs sends red water flowing into the sea.

Fabulous formations, weird and wonderful wildlife.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

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

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

This black church sits alone among a field of lava rock.

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