Meanwhile, Antoni Gaudí's famous Sagrada Família in Barcelona, Spain, which features 18 ornate towers, stained-glass windows, and numerous ruled surfaces, has been a work in progress since 1882.

Barcelona's work in progress is to be topped off.

Laura French Antoni Gaudí's Park Güell is as whimsical ... And instead of drab administrative buildings, the welcome centers here (which house park souvenirs and learning materials on Gaudí ...