The main reasons for visiting the city are: its historical monuments, recreation as well as relatives and friends (placing third in the ranking), religion and business. There are 120 quality hotels in Kraków (usually about half full) offering 15,485 overnight accommodations. The average stay last for about 4 to 7 nights. The survey conducted among the travelers showed that they enjoyed the city's friendliness most, with 90% of Polish tourists and 87% foreigners stating that they would recommend visiting it. Notable points of interest outside the city include the Wieliczka salt mine, the Tatra Mountains to the south, the historic city of Częstochowa (north-west), the well-preserved former Nazi concentration camp at Auschwitz, and Ojcowski National Park, which includes the Renaissance Castle at Pieskowa Skała. Kraków has been awarded a number of top international rankings such as the 1st place in the Top city-break destinations 2014 survey conducted by the British Which?.