Geological storytelling.

An abandoned Indian-inspired mansion.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Giant granite sculptures representing family on the northern coast of Spain.

The oldest Roman lighthouse still in use.

A Romanesque tower appears when water levels drop.

Stunning Roman aqueduct used for 1900 years and still standing.

The final resting place of the great navigator, or maybe his brother.

This house's itty bitty size means no humans allowed.

An architect transformed this abandoned cement factory into his castle-like workshop.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Bacteria and algae give the salty water its bubblegum hue.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

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

An archeological treasure trove stumbled upon by a couple of children.

This 19th-century fountain's namesake animal isn't what you think it is.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

This sprawling collection of saintly relics includes such fascinations as wood from the Cross of Jesus and threads from Mary's veil.

Ruins of a once-prized railroad station in New York.