Mondorf-les-bains, Luxembourg

With a population of just 5,432, Mondorf-les-Bains is a small spa town that relies heavily on its casino and mineral springs to attract visitors. However, the town's fortunes have ebbed and flowed over the decades, with periods of decline punctuating its history. Bureaucracy is a persistent headache, as the state had to step in to revive the spa's fortunes in the late 19th century. While the town's Rococo church and verdant park offer some charm, Mondorf-les-Bains is best suited for retirees and tourists seeking a quiet, low-key getaway, not young professionals or families seeking vibrancy.