In this historic region, homes and churches are carved into ancient volcanic rock formations.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This chapel is the site of a yearly pilgrimage that originated during the Middle Ages.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

An abandoned town is hidden in Great Smoky Mountains National Park.

66,000 pieces of art, donated by one of the world's richest men.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

This granite rock face is named for the magnificent reflection that occurs when the sun hits it just right.

Frida Kahlo's childhood home, now a museum of her life and works.

This often-overlooked ocean walkway was once considered an impossible fantasy.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

A 17th-century bezoar, dirt from an infamous site, and other curios decorate this unusual bar.

This airport also offers travelers the chance to view thousands of years of Turkish history.

Historic medieval fortified city in southwest France.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

Cliffside houses provide a spectacular view from their perch above the valley.

An automaton perched above an classic clock and watch store