Estonia, Lithuania, and Latvia encircle the Baltic Sea and are among the most beautiful countries in the world. Tallinn, Estonia’s capital, is located in the Baltic Sea’s Bay of Finland. It has a bustling port with ferry links to Finland and Sweden, as well as bus and train connections to St. Petersburg. Tallinn, one of Europe’s best-preserved medieval cities, is a UNESCO World Heritage Site. Vilnius has 65 churches, the oldest of which is St. Casimir’s. Riga’s Art Nouveau architecture is said to be the world’s largest collection.