Europe is a popular destination for solo travelers, but it can be expensive. However, there are some affordable options. Budapest, Hungary, offers beautiful architecture, thermal baths, and delicious food at a reasonable price. Lisbon, Portugal, is also a great choice for solo travelers on a budget, with its charming streets, historic sites, and affordable accommodations. Krakow, Poland, is another affordable destination with a rich history, stunning architecture, and delicious food.