Before I left Sydney I visited the Powerhouse Museum one afternoon with a few friends. They were currently hosting the famous Harry Potter exhibit - but none of us wanted to pay the $40 admission fee so we just saw the rest of the museum. It was an incredible museum with machines from the Industrial Revolution, old stage coaches, robots, and even making your own fireworks. One exhibit highlighted the latest engineering developments, including a house with walls made of high-powered air. There was also a robot that would respond to your commands and another robot that challenged you to a dance off. It was definitely one of the best museums I’ve been in.