With so much effort put into this breathtaking structure, we had to make it number one. Today, over 140 years since the laying of the first cornerstone, construction continues on what must surely be the world’s most beautiful building site.

Due for completion in 2026, 100 years on from the death of the cathedral’s chief architect Antoni Gaudí, five generations of Barcelonians have seen the Sagrada Família rise up and tower over their city. It was designed so that its highest point would be just below that of nearby Montjuïc hill, 568 feet (173m) high, as Gaudí believed nothing made by man should be taller than 'God’s creation'.

Now see how we've ranked Spain's hidden gems

Spain's bucket-list attractions, ranked