Never judge Europe on its size. The second-smallest continent is a lesson in diversity. You can spend one day glowering up at the wrought-iron outline of the Eiffel Tower and wake the next to the sound of the waves sloshing against the Croatian Adriatic. It ranges from 4,000-meter-plus summits at Mont Blanc to undulating Hungarian steppes, from lush winelands in Rioja to moss-clad forests in eastern Poland.