This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

The oldest continuously occupied public building in the United States.

This giant pocket watch is the third iteration of a local landmark that has been standing just off the Santa Fe Plaza for over 100 years.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

This tiny chapel atop a sea stack is dedicated to the patron saint of Ponza, Saint Silverius.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

Perhaps the most spectacular grotto along the Algarve coastline.

This 1st-century CE Roman bath sits under a carpark.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

This nearly abandoned town was once a thriving mining community until a series of fires.

This ancient amphitheater was restored in the early 1990s.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

This long-abandoned village sits across a narrow gorge from a still-inhabited settlement that was once its twin.

The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

This historical manor is complete with a magnificent garden.

The young girl gained fame for her atypical size and was regarded as a curiosity by the Spanish aristocracy.

This 18th-century project to build the world's tallest gravity dam was never completed.