One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

This abandoned viewing platform has become a monument to unnecessary government spending.

Beautiful tiles decorate many of the town's surfaces and stand testimony to its glorious artistic history.

Vibrant street art created with mixed media.

Locals use these rock pools and waterfalls for swimming and cliff diving.

This decorative arch symbolizes the history of this medieval village but still maintains a modern purpose.

This sculpture in Valencia features 22,000 tiny, obsidian blue figures that pay homage to the Lady of Elche.

This architectural oddity is an oasis of green on the outskirts of Valencia.

This house's itty bitty size means no humans allowed.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

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

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Descend into the tunnels to experience the life of a coal miner.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

This historic electric train has operated with regularity since the early 1900s.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

A Spanish town built into the cliffs.

The world's largest wooden structure.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

For more than a century, Parisians have come for affordable dishes in a grand converted train station.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

This abandoned Belgian fortress is purposefully being left to nature.