Barcelona is Gaudi
The view from Park Guell looking out across Barcelona to the Mediterranean, with the plaza unusually empty.
Barcelona wouldn't be Barcelona without the whacky organic buildings by Gaudi which are scattered across the city. They're organic, they're kinda bulbous in a less-pretentious-than-Gehry way, and they're usually covered in crazy-bright mosaics.
Unfortunately they're also covered in tourists. Our planned Gaudi tour never actually happened, so I just might have to go back again one day and visit everything again with an actual trained guide.