A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

A century after his death, this covered bridge still calls to mind the plein air painter who loved it.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

A pair of gigantic baby heads greet passengers at Atocha Station.

An ongoing medieval tradition of communal pig husbandry is honored with a handsome granite sculpture.

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

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

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

Seaside ruins of a settlement that date back to the first century B.C.

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

Medieval ruins nestled within a breathtaking swath of Spanish nature.

A spectacular walk on the flank of a gorge.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

Experience what life was like in Ireland during the Viking and medieval ages.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

The oldest Roman lighthouse still in use.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

This curious, round temple is the oldest still-standing marble building in Rome.

A massive marble foot is tucked away in a small alley near the Pantheon.