Visited the Biosphere on Museum Day which is the last weekend in May so it was free for us to enter. Inside the Biosphere there is exhibitions on Water, fashions made from waste products, cars and sustainable fuel sources. There are some interesting things for kids but also a lot of reading. Its a good place to visit if you want to find out about sustainability but didn't take us more than an hr to see everything so I would have been disappointed if I had paid admission. It was built during the expo 67 and is easily accessed by subway nearby or by car from downtown.