These engineering masterpieces are a dominant feature of the Belfast skyline.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

These strikingly colorful paintings were created by a mysterious Mesoamerican civilization.

One of Europe's oldest yew trees has lived more than 2,000 years.

Remote ruins of a 2,400-year-old Iberian settlement.

Archaeological site of Iberian people ruins.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

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

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

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

A Spanish forest is filled with mysterious stone carvings.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.