Tallinn, Estonia

Tallinn is the most technologically advanced and best-preserved medieval city in Europe simultaneously — a combination that makes it the most interesting solo travel destination in the Baltic region. The UNESCO-listed Old Town has the highest concentration of intact medieval architecture in Northern Europe (better preserved than Prague, which suffered more post-war development). Estonia is the world leader in digital governance: its e-Residency program, digital voting, and digital health infrastructure mean the country operates with a technical sophistication that manifests in everything from seamless public transport payments to 24/7 government services. The solo traveler advantage: Tallinn is compact (population 440,000), English is nearly universal among under-40 residents, and the café and co-working culture is strong. Cost: mid-range by European standards ($50-80/day), well below London or Scandinavian cities. Best visited May-September before the Baltic winter.