The Historic Centre of Sighișoara (Sighișoara Citadel) is the old historic center of the town of Sighișoara (German: Schäßburg), Romania, built in the 12th century by Saxon colonists under the Latin name Castrum Sex. It is an inhabited medieval citadel that, in 1999, was designated a UNESCO World Heritage Site for its 850-year-old testament to the history and culture of the Transylvanian Saxons.