8. The Crystal, London
Photo: Jim Linwood
Not only is The Crystal a unique looking building that closely resembles its name, it is also one of the most eco-friendly structures around the globe. The museum is powered with solar power, as well as a ground source heat pump. A rainwater harvesting system is also built into the structure and it has its own black water treatment. Inside the unique looking building, you will find an extensive exhibit covering sustainable living and urban sustainability.