When Andy and I were in Barcelona, Spain a few weeks ago, the one thing I wanted to make sure I saw was la Sagrada Familia. The cathedral was designed by Gaudi but is in a perpetual state of construction. Not only is it an incredibly unique building, but the details, like this kissing couple, can keep your attention for hours.
Traveling to Barcelona? Check out the 100 Locals Unconventional Guidebook series by Gigi Griffis, which includes a guide for Barcelona!