It’s already called the world’s greenest museum…but it just got a little greener. The California Academy of Sciences in the U.S. opened in 2008 as a model of eco-friendly technology, and the U.S. Building Council gave it a platinum award. Now, the museum has won another – two times platinum, and as environmentally-conscious as ever.

The structure itself (right in the heart of Golden Gate Park) is an homage to sustainability and green living: it has a hilly, plant-covered living roof, insulation made of recycled denim, an entire canopy of solar panels and other green technology. And there’s a lot to see inside, too, like an aquarium, a planetarium and a natural history museum. National Public Radio in the U.S. did a report on the museum when it first opened, and they shared some amazing pictures here. Check them out!