Slot Heemstede is the site of the old castle of Heemstede. The property is situated at the site of the former castle 'Heerlijkheid Heemstede', or 'Huis te Heemstede', at a strategic position on mouth of the Spaarne river on the Haarlem lake (since 1853 pumped dry and called the Haarlemmermeer (...) (from Wikipedia)