Ukraine occupies 8th place in Europe by the number of tourists visiting, according to the World Tourism Organisation rankings, because of its numerous tourist attractions: mountain ranges suitable for skiing, hiking and fishing: the Black Sea coastline as a popular summer destination; nature reserves of different ecosytems; churches, castle ruins and other architectural and park landmarks; various outdoor activity points. Kiev, Lviv, Odessa and Kamyanets-Podilskyi are Ukraine's principal tourist centres each offering many historical landmarks as well as formidable hospitality infrastructure. Tourism used to be the mainstay of Crimea's economy but there has been a major fall in visitor numbers following the Russian annexation in 2014.
The Seven Wonders of Ukraine and Seven Natural Wonders of Ukraine are the selection of the most important landmarks of Ukraine, chosen by the general public through an internet-based vote.