Sea and desert
If I had to summarize Spain in two words they would be "Sea" and "Desert". It´s great the way the Spanish took advantage of their long coast, and dramatic the arid look of most of the landscape. Of course, towns are different, and we have lively people inviting us, but travelling across Spain is tiring and sometimes boring.
Yes, no need to remind me, I know that I have the privilege to live in Portugal, where distances are short, desert areas very limited (so far!) with landscape changing quite often.