Build your excitement—it"s World Architecture Day! Today"s image features the Elbphilharmonie on the Grasbrook peninsula of the Elbe River in Hamburg, Germany. Designed by the Swiss architecture firm Herzog & de Meuron, this concert hall is a modern architectural marvel perched atop an old brick warehouse from 1963. A centerpiece of the new Hafencity development, it"s Hamburg"s tallest inhabited building—there are 45 luxury apartments in the upper floors—reaching a height of 354 feet.