Giant beam engines, the earliest built in 1820, operate under steam and are the largest of their kind in the world. Housed in a Victorian waterworks visited by Dickens, these engines pumped London's water for over 100 years. Interactive gallery 'Water For Life' explores 2000 years of London's water. There is a steam railway and a waterwheel. The massive steam pumping engines are in steam at weekends and Bank Holidays only. Special events throughout the year.