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Photo: CTHOE, CC BY-SA 3.0 via Wikimedia Commons
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.
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Former hospital, established in 1223 by Saint Elizabeth of Thuringia. The current Baroque-style building was constructed in 1716–1719.
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.
Place where the Socialist Workers' Party was established in 1875
Margarethenkirche
Late-Gothic hall church; one of the town's oldest extant buildings.
Schlosspark
The 91-acre park is one of the biggest in Germany and a very beautiful, too. It was one of the first English-style landscape gardens in Germany and all of continental Europe. There is a number of very old trees, including some 500-year-old oaks.
Herzogliches Museum
The Dukes' arts collection, including Egyptian and Graeco-Roman antiques, Renaissance paintings, East Asian arts and sculptures of different eras.