Geographically it's the smallest continent, but Europe's diverse and rich in history, the authenticity and passion shown by its population, and the good humoured and fun character of its cities, make the whole continent an ultimate travel destination. Here are 20 top European cities to visit: 1. Rome 2. Venice 3. Barcelona 4. Berlin 5. Amsterdam 6. Paris 7. Prague 8. Dublin 9. Edinburgh 10. London 11. Athens 12. Warsaw 13. Madrid 14. Brussels 15. Vienna 16. Florence 17. Copenhagen 18. Munich 19. Budapest 20. Lisbon