Hard to believe, but Park Güell was originally meant to be a swanky residential project. Eusebi Güell hired Gaudí in 1900 to design a hillside community for Barcelona’s elite. Fancy homes, garden views, and fresh air, it had all the makings of a dream neighborhood. But by 1914, the project flopped—only two houses were ever built. So instead of mansions, we got mosaics and monuments. The estate became a public park in 1926, and the rest is colorful, curvy history.