What is "bauschanzli"

Bauschänzli is a town square and a public park in Zürich, Switzerland. Bauschänzli (diminutive of "construction entrenchment") is one of the last remains of the Baroque fortifications of Zürich which began in 1642. The neighboring Schanzengraben (moat) and the Old Botanical Garden are part of the last remains as well. Since 1907, the island has been used as a restaurant, although it is officially a public square and park.