Eco roofs, and their more visible cousins vertical gardens, are inspiring pieces of architecture which are usually difficult to view, since getting on top of a building is often prohibited or just a hassle. The California Academy of Sciences roof, pictured above, makes it a little easier to take in the benefits and beauty of rooftop greenery. Here is an entire photo gallery devoted to eco roofs of the world, and here is a Flickr pool.

Image Credit: Arex/CreativeCommons