Kyiv was the historic cultural centre of the East Slavic civilization and a major cradle for the Christianization of Kyivan Rus. Kyiv retained through centuries its cultural importance and even at times of relative decay, it remained the centre of primary importance of Eastern Orthodox Christianity . Its sacred sites, which include the Kyiv Pechersk Lavra (the Monastery of the Caves) and the Saint Sophia Cathedral are probably the most famous, attracted pilgrims for centuries and now recognized as a UNESCO World Heritage Site remain the primary religious centres as well as the major tourist attraction. The above-mentioned sites are also part of the Seven Wonders of Ukraine collection.