Europe is a beautiful and fascinating continent, home to many small as well as large countries. This includes large countries such as Russia and smaller countries such as Liechtenstein and Vatican City. Europe is home to many of the world's best tourist attractions and is visited by millions of travelers every year. London, Paris, Rome, Barcelona, Prague, Istanbul, St. Petersburg, Amsterdam, and Lisbon are the major cities. Europe is rich in natural wonders, with over 350 national parks across the continent. Iconic landmarks in Europe include the Eiffel Tower, the Leaning Tower of Pisa, the Colosseum in Rome, and St. Basil's Cathedral in Moscow. Europe has a lot to see, including mountains, waterfalls, cliffs, and beaches. Europe is also a popular honeymoon destination, with cities like Venice, Paris, London, and Rome making for great romantic getaways. It is also home to several UNESCO World Heritage Sites, ancient castles, and seaside towns. The ideal time to visit Europe is May, June and September. Cruise lengths vary from 5 to 20 days.