The Cruquius Machine was the most ambitious and beautiful of three stations used to drain the Haarlemmermeer Polder of water between 1849 and 1852. It is the polder in which Schiphol Airport now lies - 4.5m below sea level. Over three years the Cruquius's boilers burned 800kg of coal every hour of every day, pumping 800 million tonnes of water back to the sea.  Built by Harvey and Co., Cornwall, England with some Amsterdam steelwork, it is thought to be the largest steam engine ever built, and is now a museum.
The model above is interesting because it represents the original plans for the Cruquius, with 13 pistons driving 13 pumps around its perimeter.  In reality - and mathematically more simply - there are only 8.