Synagogues function as places of worship, schools, town halls, and communal hubs in Jewish communities across the world. It is the Temple on Jerusalem's Mount Zion. The Second Temple was destroyed by the Romans in 70 CE. Since then, Orthodox Jews have not accepted any other structure as being identical to the temple it replaced. Any attempt to build another temple will be considered a desecration of the site. In the time since the destruction of the Second Temple, new synagogues have been built throughout Europe. These structures include churches on which a synagogue has been built over the altar or nave, usually without altering the exterior. There are also synagogues that were originally mosques or Greek temples that were adapted for use by the Jewish community. Some modern synagogues retain features of these earlier buildings, while others are completely redesigned. In Israel, many towns have both a synagogue and a church. The two communities often work together to maintain their buildings, although they do have separate clergy who lead prayer services daily. Israel's oldest standing synagogue is located in Hebron. It was built more than 300 years before the destruction of the Second Temple.