Margarethenkirche

The Protestant Margarethenkirche is a late Gothic hall church and is one of the oldest buildings in the city. After the devastating destruction of the Second World War, the church was renovated in simple beauty. The wooden coffered ceiling provides a wonderful acoustics, the large sanctuary offers plenty of scope for services and concerts.

No open church

The Margarethenkirche in Gotha is a late Gothic hall church on Neumarkt and is one of the oldest buildings in the city. The church was first mentioned in 1064 in an inheritance sale deed.
Source: thueringer-wald.com

Duke Ernst the Pious was buried in 1675 as the first member of the House of Saxe-Gotha-Altenburg in the vault under the sanctuary. Until the completion of the new royal crypt at Schloss Friedenstein in 1680, the members of the ducal house in Sankt Margarethen were laid to rest, including Ernst's wife, Duchess Elisabeth Sophia, as well as some of the couple's early-deceased children. Wikipedia

Unfortunately closed when we visited.

The Margarethenkirche in the middle of the city is a late Gothic hall building (first mentioned in 1064) and is considered Gotha's main church. In 1522, the pastor of Sankt Margareten proclaimed the gospel and thus promoted the Reformation in Gotha as well.

The baroque interior of the church took place between 1725 and 1727. With the consecration of the Schuke organ (1961), lively concert activity began again in the Margarethenkirche, which continues to this day. The German Music Festival took place here as early as 1812, in which Carl Maria von Weber and the Gotha Court Kapellmeister Louis Spohr also took part.
Source: tourismus-thueringer-wald.de/bach-und-mehr/margarethenkirche-gotha