Israel itself is a very sacred place to Jewish people. A lot of Jewish people that do not live there would want to visit here sometime in their life. The most popular city in Israel is Jerusalem because it is the ancient capital of Israel and is the site of the Temple Mount.
Jerusalem is also the most holiest city in Judaism and is the place where Jews turn for prayer. The four holy cities are Jerusalem, Tiberias and Safed; Jerusalem is the holiest of the four cities.
The Temple Mount is regarded as the place where God chose the Divine Presence to rest. It is regarded as a place for many important events of the Bible, made dubbed the holiest site in Jerusalem.