Citadel of Sighisoara (Transylvania) Fortress of Sighisoara was founded by Transylvanian Saxons in the XII century and is considered one of the most beautiful and best preserved medieval castles inhabited in Europe. The city is named UNESCO world heritage sites. This almost unscathed pearl of XVI century for its 9 towers, cobbled streets, burgher houses and ornate churches, creating a magical atmosphere, competes with the historic streets of old Prague or Vienna.