A closer look

Commuting across the Baltic Sea isn't just about getting from Stockholm to Helsinki; it is a full-blown cultural phenomenon. Because maritime tax loopholes allow for duty-free alcohol in international waters, these massive overnight ferries function less like public transit and more like 12-story floating raves. Expect to find grand promenades, saunas, and thousands of partying Scandinavians maximizing their weekend on a boat that technically serves as a highway.