The Protestant parish church of St. Johannis in Wernigerode is located on the north-western edge of the historic new town and is the oldest preserved church in the town.
The church's most valuable and important piece of equipment is undoubtedly the four-winged carved altar in the choir. A date on the back indicates that it was created in 1415. The new choir windows in St. John's Church were inaugurated in August 2016. The windows, designed by Wernigerode artist Günter Grohs, protect the more than 600-year-old Marian altar from UV radiation and also provide a worthy backdrop. The Ladegast organ from 1885 is an outstanding document of late Romantic organ building in Germany, both in terms of sound and technology.