This Guell Park in Barcelona, Spain it is an incredible park full of the coolest mosaics. According to Rick Steves this park was originally designed as a sort of Gated Community. The project flopped as an upscale housing area and is now a fabulous park.
Barcelona - Ceiling of the Sagrada Familia, Spain. The columns of the interior are a unique Gaudí design. Besides branching to support their load, their ever-changing surfaces are the result of the intersection of various geometric forms.