The Gottesackerkirche St. Trinitatis in today's Arboretum was built between 1734 and 1739 with travertine stones from St. Mary's Church, which was destroyed in the Thirty Years' War.

The cartouche above the eastern main portal commemorates the patronage of Duke Christian von Sachsen-Weißenfels over the construction of the church. The pointed arch portal on the west side forms the entrance to the restored crypts. In contrast to the austere, symmetrically structured exterior, the rich Baroque interior of the hall church surprises with its two-storey wooden galleries and pulpit altar from 1734. The vaulted ceiling was particularly lavishly decorated with Baroque paintings in oval medallions and stucco work. The interior also includes a relief of a Madonna from St. Mary's Church, two baroque epitaphs and an organ by Friedrich Erdmann Petersilie (1869). Extensive refurbishment and restoration work from 2008-2009 gave the cemetery church, which has been converted into a concert church, a new lease of life. The diverse musical events promise a listening experience in unique acoustics.