The facade of this 16th-century building is decorated with carvings of 300 seashells.

This 13th century convent is now a medieval painting museum.

The much-loved protagonist of famed Argentinian comics can be found sitting on a park bench.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

This giant sculpture made of trash is a critique of society's wastefulness.

A beautiful example of 18th-century engineering still standing tall.

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

This remarkable museum sprung from one of the most important prehistoric archaeological sites in the world.

An Antoni Gaudí masterpiece in Astorga.

This enormous censer uses a pulley system installed over 400 years ago.

An accidental trick of light casts the perfect shadow of a pilgrim of the Camino de Santiago against the cathedral wall.

The oldest Roman lighthouse still in use.

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

Stormy conditions send jets of seawater bursting through holes in the cliffs.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

Giant topiary dog once played a role in a terrorist bomb plot.

Marvel at this immense work of art that greets arrivals to the city.

This 19th-century fountain's namesake animal isn't what you think it is.

This stunning concert hall has become a symbol of Iceland's national recovery.

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

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

Like your grandma's attic—if your grandma were a little weirder, extremely well-traveled, and had a great eye for art.

Take a selfie with one of the area’s founding fathers.

The beauty and the beast of hydraulic mining is on full display at this California Historic State Park.