Toompea Castle in Tallinn has served as the centre of power in Estonia for over 800 years, now housing the Estonian Parliament. The castle's current late Baroque façade was constructed between 1767 and 1773, blending medieval fortifications with Czarist architecture and the early 20th century Riigikogu building. The iconic Pikk Hermann tower, standing 46 metres high, remains a national symbol. The castle and surrounding old town are UNESCO World Heritage Sites, representing one of Europe's best-preserved medieval urban ensembles. Visitors can access the castle free of charge, with guided tours available.