The holy sites of all three religions can be found in the Middle East, where all originated. More specifically, all have sites located within the current nation of Israel.
Most religions of the world do not have holy sites near (or in) Israel, such as:Ancestor WorshipBuddhismCao DaiConfucianismDruidsHinduismNative African ReligionsNative American ReligionsShenismShintoismSikhismTaoismTengriismWiccansAdditionally, a number of minority Middle Eastern religions have no holy sites in Israel: Mandaeanism and SabianismShabakismYarsanism (Ahl-e-Haqq)YazidismZoroastrianismIt may perhaps be easier to list those religions with holy sites near or in Israel JudaismChristianityIslamBaha'iDruze
Judaism, Christianity, and Islam. Those are the major, monotheistic religions in the region. The minority religions of Druze and Baha'i also have holy sites in Israel.
The holy sites of all three religions can be found in the Middle East, where all originated. More specifically, all have sites located within the current nation of Israel.
Currently, the Jewish Holy Temple no longer exists since it was demolished in 70 CE. However, there are numerous holy sites and holy houses of worship all across Israel.
The Middle East, in particular the city of Jerusalem in Israel has holy sites for all 3 of those religions.
In Safed (Israel), the holy sites are:The entire Old City -- It is the place where Kabbalah or Jewish Mysticism was founded.Ari Ashkenazi Synagogue
The Middle East, in particular the city of Jerusalem in Israel has holy sites for all 3 of those religions.
Holy Land.
Israel is probably the country with the largest variety of holy sites for different faiths (Judaism, Samaritanism, Christianity, Islam, Baha'i, Druze, etc.) However, other countries also have holy sites that are multi-religious. India has a number of Sufi Tombs that are holy for both Muslims and Hindus. The Tombs of Ezra and Ezekiel in Iraq are holy for Jews, Muslims, and Mandaeans. The Chinese religions (Shenism, Daoism, etc.) often share holy sites and temples.
The Holy Land typically refers to the region in the Middle East that is of significance to Judaism, Christianity, and Islam. It includes areas such as Israel, the West Bank, and parts of Jordan. Many important religious sites can be found in this region, such as Jerusalem, Bethlehem, and Nazareth.
Elevation, location of aquifers, holy sites, particular cities of interest, terrain issues, historic property rights, etc.