The
Pump House Cruquius, which was used to drain the lake, is a Dutch
Rijksmonument for the history of the
James Watt steam engine within. The Ringvaart, the Cruquius Pump House, the dike itself, and various other components such as aqueducts, bridges and defense bunkers located south of the dike of the
Stelling van Amsterdam (Defense line of Amsterdam) are considered a
World Heritage Site. The main dike of the Stelling van Amsterdam runs diagonally across the Haarlemmermeer polder and crosses the Ringvaart twice.
Fort Vijfhuizen located on the Ringvaart is used for art exhibitions. ==See also==