Tallinn , the capital of Estonia, lies on the southern coast of the Gulf of Finland, only 70 km (43 mi) south of Helsinki. At the historical and medieval heart of the city is the hill of Toompea, covered in cobbled streets and filled with medieval houses and alleyways. The lower town spreads out from the foot of the hill, still protected by the remnants of a city wall. Around the city wall is a series of well-maintained green parks, great for strolling.