The Old Town of Tallinn has outstanding universal value because its medieval trading city characteristics have been preserved throughout the centuries and it continues to function as a living environment with a variety of residential houses, public buildings and churches. Its original street network, largely intact town wall and many of its buildings date back to medieval times. The Old Town is also known for its historic earthworks that have been turned into green areas and its rich layers of archaeological finds. The unique silhouette of Tallinn can be seen from land as well as from the sea.