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Late-Gothic hall church; one of the town's oldest extant buildings.
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Former hospital, established in 1223 by Saint Elizabeth of Thuringia. The current Baroque-style building was constructed in 1716–1719.
Winterpalais
Neoclassical city palace from 1822. Having decayed during the 1990s and 2000s, it had to be teared down and was completely rebuilt in 2014. Now it hosts the city library.
Schloss Friedenstein
Early-Baroque palace of the Dukes of Saxe-Gotha, built in 1643–1654 as one of Germany's biggest 17th-century stately homes. The complex includes the Schlossmuseum (museum), museum of regional history, huge numismatic collection, the Ekhof-Theater (ducal court theatre), a research centre as well as the palace chapel and ducal tombs. The casemates of the palace's fortress are accessible, too.
Augustinerkirche
Former monastic church of the Augustinian Hermits. Martin Luther (who was an Augustinian Friar himself) preached here in 1521. Rather modest Gothic hall church from the outside, but contains a rich Baroque interior, including a stately box for the Dukes and an early-Baroque organ case.
Schloss Friedrichsthal
Baroque three-wing summer residence from the 1700s, modelled on Versailles.