La Sagrada Familia in Barcelona, Spain. One of the few "modern" church designs that I find completely compelling.
La Sagrada Familia in Barcelona, Spain - no matter how long you look at this cathedral you always see something new
Temple Expiatori de la Sagrada Família (Barcelona, Spain) by Gaudi This one of the most beautiful buildings I have ever seen.
Barcelona, Spain - Sagrada Familia - Gaudi I've been there once but didn't get to see the light through the stained glass like this!