Seemingly plucked straight from an exquisitely illustrated storybook, Lake Bled is a strong contender for Europe's most romantic hidden gem. Take a boat out to the teardrop-shaped island in the middle of the water and sweep your significant other off their feet by carrying them up the 99 stone steps to reach the Church of the Assumption of Mary. If you succeed, Slovenian legend says you are worthy enough to marry your beloved. Tip, attempt the stairs before tucking into a slice of potica cake.