Wasserkirche

According to medieval tradition, the site was used for the execution of Saints Felix and Regula.

The library was merged into the Zentralbibliothek in 1917, and the church was used as a storage room for crops for some time, until reconstruction work and archaeological excavations were undertaken in 1940.

Following this the building was again used for services by the Evangelical-Reformed State Church of the Canton of Zürich.

The Helmhaus is an extension of the church to the north, first mentioned in 1253 as a court of criminal justice, at which time it was a simple wooden structure covering the eastern end of the bridge.

It was extended to a larger wooden structure in 1563, and replaced with a stonework hall in 1791.