The Spaarne is a river in North Holland, Netherlands. This partially canalized river connects the Ringvaart to a side branch of the North Sea Canal. It runs through Haarlem, Heemstede, and Spaarndam. The historic canals of Haarlem's moats are connected to the Spaarne. A lock at Spaarndam separates it from the North Sea Canal. According to Sterck-Proot, a historian, the name Spaarne probably comes from Spier, which means reed in old Dutch.

The building was designed by Lieven de Key around 1597 and is built with Namense steen from Namur, Belgium. It is the only building in Haarlem that was built this way, and was designed in its day as a landmark that befits an authority. The weigh house masters needed to be able to judge the correct measure of a shipload of grain that was delivered in Haarlem. Inside the large cast iron balance can still be seen. The location of the weigh house was strategically located where the Spaarne river joins the beek, a small canal that according to tradition was used to carry fresh water from the dunes to serve the brewers of Haarlem. Haarlem was known for its beer brewing in the 15th-17th centuries. A large wooden crane operated by wheels driven by manpower was used to hoist the grain on ships into the Waag building and back into other ships or carts for further transport. The wooden crane can be seen on most historic pictures of the Spaarne up until 1872.

Teylers Museum is an art, natural history, and science museum in Haarlem, Netherlands. Established in 1778, Teylers Museum was founded as a centre for contemporary art and science. The historic centre of the museum is the neoclassical Oval Room (1784), which was built behind the house of Pieter Teyler van der Hulst (1702–1778), the so-called Fundatiehuis (Foundation House). Pieter Teyler was a wealthy cloth merchant and banker of Scottish descent, who bequeathed his fortune for the advancement of religion, art, and science. He was a Mennonite and follower of the Scottish Enlightenment.

Heemstede formed around the Castle Heemstede that was built overlooking the Spaarne River around 1286. Before 1296, Floris V, Count of Holland, granted Heemstede as a fiefdom to Reinier of Holy. During the 14th century, a village formed near the castle, which was destroyed and rebuilt several times in this period. A resident of this castle was Adriaan Pauw, who bought it in 1620. In 1653, Bennebroek split off from Heemstede, becoming a separate fiefdom.

In 1778 the Amsterdam businessman Adriaan de Boois bought an old defense tower. He received permission from the city of Haarlem to build a windmill. Adriaan built his windmill on top of the old Goê Vrouw tower. As a result, the mill blades rise high above the Spaarne and catch every breeze possible. On 19 May 1779 the Adriaan smock mill is put into use. For years Adriaan de Boois ground tuff, a sort of volcanic stone, into trass. Trass is a special additive added to mortar to make walls waterproof.