Lithuania's outdoor sculpture trail of wooden folk art.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

This home on a quiet suburban street is completely covered with vibrant mosaics.

In this coastal town, the time-honored tradition of reenacting the struggle between the Christians and Moors includes the arrival of the Moorish fleet.

This 47-story "M" needed 20 years to be completed

This amazing piece of modern art honors the hundreds of fishermen killed during Cambrils' "year of misfortunes."

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

Stunning Roman aqueduct used for 1900 years and still standing.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

Hidden well off the beaten path in Catalonia is this crumbling medieval castle that is slowly being covered in graffiti.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

One of Europe's largest supercomputers is housed inside of a disused chapel.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The site of the first medieval crusade that pitted Christians against Christians.

This is what trains will look like after the zombie apocalypse.

This "social palace" housing complex created a relatively stable and self-contained worker's society... for a time.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

This witch statue remembers a time in England's history when fear trumped truth.

The photographs of "fairies" that fooled much of the world (including the creator of Sherlock Homes) were taken at this English stream.

Quirky outsider art transforms this garden shop into a little stone fantasyland.