Slovenia

The most underrated country in Europe for solo travelers. Slovenia is tiny (2 million people, smaller than New Jersey) but packs the Alps, Mediterranean coast, karst caves, and Ljubljana (a car-free capital with a dragon mascot) into a space you can cross in 3 hours. Lake Bled is one of the most photographed places on Earth and it's still not overcrowded. The country is a 3rd cheapest in the Eurozone, extremely safe, and Slovenians speak 3+ languages on average. The Vrsic Pass, Skocjan Caves, and the Soca River valley are all world-class and largely unknown outside Europe.