Halfway Haarlemmerstraat is the Hartebrug church. One of the typical 'waterstaat' churches about which I explain at length on my Amsterdam page (Moses and Aaron church). It was built with government money because the church communities were too poor to do this. The reformed churches had confiscated the beautiful really old churches and so the catholics had to resort to new buildings once they were allowed to practise publicly again.
The church front shows a Latin text saying: Hic Domus Dei est et Porta Coeli meaning This is the house of God and the gate to heaven. People usually call this church the Koeliekerk.
The Gothic Pieterskerk is a good example of the mixture of Brabantine Gothicism and local common sense, as found in many cities along Holland's coast. To prevent the building from sinking in the moist soil the building is unusually wide and has a wooden ceiling instead of stone vaults. Construction of this church was started in 1390. A 130 metres tall tower collapsed in 1512 and was not rebuild. The church came in protestant hands in 1570, but is no longer used as a church. Inside are the graves of many famous people, including that of painter Jan Steen.
The Hartebrug church was built in 1865 and is still in use as a church. It is a bit of strange contrasting building compared to the other buildings in Leiden.
This church is mostly in use for confrences etc. for a nice view inside the church look at their website. For me it is just a nice built church in a beautiful old townsetting.
The chapel of this church is dedicated to the patron saint of France, St. Louis (Lodewijk). The original chapel was founded in the 15th century, but this church was built in 1925.
Built between 1639 and 1679, this eight sided church was built beside the Mare River. The architect was Arent van 's-Gravesande.
The Marekerk is a protestant church from the 17th century. It was built in 1649 by the architect Arend van 's-Gravensande. The church is built as a 8-sided building.
There are many old churches in Leiden
These churches are mostly protestant and date from various periods. Often, they have famous antique organs.