Mentioned by London City Calling
50 free things to do in London
"Another of the best free museums in London, and one of my personal favourites, is South Kenisngton’s Science Museum, covering various aspects of science and human achievement, from the exploration of space to the invention of modern digital technologies. Spanning multiple floors, the museum has a collection of over 300,000 items, including some amazing world-famous objects such as the Apollo 10 command capsule, Helen Sharman’s spacesuit(the first Briton in Space) and Puffing Billy (world’s oldest surviving steam locomotive). There are also a number of interactive exhibits such as a 3D IMAX cinema showing science and nature documentaries throughout the day."