The Jews of Ukraine constitute the third largest Jewish community in Europe and the fifth largest in the world. Jews are mainly concentrated in Kyiv(110,000), Dnepropetrovsk (60,000), Kharkov (45,000), and Odessa (45,000). Jews also live in many of the smaller towns. Western Ukraine, however, has only a small remnant of its former Jewish population, with Lvivand Chernovtsy each having only about 6,000 Jews. The majority of Jews in present-day Ukraine are native Russian/Ukrainian speakers, and only some of the elderly speak Yiddish as their mother tongue (in 1926, 76.1% claimed Yiddish as their mother tongue). The average age is close to 45. In the 19th century, Ukraine, as a part of the Pale of Settlement, was densely populated by Jews. Despite restrictions, Jews played a prominent role in the development of commerce and industry in the region, and especially in the growth of its major cities, such as Kyiv, Odessa, and Kharkov. Many of the most important Jewish thinkers of the modern age were born there. More than half the Jews living in Ukraine were wiped out during the Holocaust. The Jews of Ukraine account for a great proportion of the Soviet victims of the Holocaust, with the worst slaughter taking place at Babi Yar outside Kyiv. The community is made up of many different Jewish religious and cultural groups, including various Zionist organizations. The Jewish population is in decline, largely due to emigration and to the aging process. Among the community's priorities is securing the return of nationalized Jewish property. Since the collapse of the Soviet Union, religious life has undergone a revival, and Jewish communities in many cities and towns have been reconstituted. Synagogues and mikvaot are now functioning in all cities and towns with a significant Jewish population. Religious leadership is provided by a number of foreign rabbis. Among the sites which attract large numbers of Jewish visitors is Uman, the burial place of Rebbe Nachman of Bratslav, and Gadyach, the tomb of Rabbi Shneur Zalman, the Alter Rebbe-the founder of the Lubavitch Chassidic movement. There are kosher shops but only one kosher restaurant.