The Grossmünster Church is a former monastery built on the graves of the city’s patron saints, Felix and Regula, and is the site of the first secondary school, which according to legend, was founded by Charlemagne. The Fraumünster and Grossmünster churches are landmarks of Zurich. His statue stands on top of the south tower, the Karlsturm. This church along with the Fraumunster are the main churches within Zurich. November to February Daily 10.00m – 5.00pm. The Karlsturm is one of the two towers of Zurich’s landmark, the Grossmünster Church. Legend has it that the church was built on the graves of the city’s patron saints, Felix and Regula. Opening Hours. March to October Centuries later the emperor Charlemagne was passing through Zurich and decided to found a church in honour of the martyrs - after a hint from his horse. Since 2009, artistically designed stained-glass windows by Sigmar Polke have decorated the Grossmünster church. As well as being a place of worship it was also the centre of a religious revolution and is the city’s most famous landmark. The Fraumünster and Grossmünster churches are landmarks of Zurich. March to October: Monday to Saturday 10.00am – 6.00pm According to legend, Felix and Regula, Zurich’s patron saints, were beheaded at the site of the Wasserkirche and then walked up to where the Grossmünster stands, taking their heads with them. Skip to main content. The convent once held great power in Zurich. This well-known German artist crafted seven windows in the nave from agate. Skip to main content. Opening Hours. Grossmünster Zurich . The Grossmünster dominates the Zurich skyline and the Niederdorf. He cut this semi-precious stone into thin slices that would let light pass through them and give the appearance of brightly glowing walls. The convent once held great power in Zurich. The Grossmünster church is a landmark of Zurich.