Gehenna (Greek γέεννα), Gehinnom (Rabbinical Hebrew: גהנום/גהנם) and Yiddish Gehinnam, are terms derived from a place outside ancient Jerusalem known in the Hebrew Bible as the Valley of the Son of Hinnom (Hebrew: גֵיא בֶן־הִנֹּם or גיא בן-הינום); one of the two principal valleys surrounding the Old City.
In the Hebrew Bible, the site was initially where apostate Israelites and followers of various Ba'als and Caananite gods, including Moloch, sacrificed their children by fire (2 Chr. 28:3, 33:6). Thereafter it was deemed to be cursed (Jer. 7:31, 19:2-6).

Zion Gate (Hebrew: שער ציון‎, Shaar Zion, Arabic: Bab Sahyun) also known in Arabic as Bab Harat al-Yahud ("Jewish Quarter Gate"), or Bab an-Nabi Dawud ("Prophet David Gate"), is one of eight gates in the walls of the Old City of Jerusalem.
https://en.wikipedia.org/wiki/Zion_Gate

Calvary (Latin: Calvariae or Calvariae locus) or Golgotha (Greek: Γολγοθᾶ, Golgothâ) was a site immediately outside Jerusalem's walls where Jesus was said to have been crucified in the canonical Gospels. Since at least the early medieval period, it has been a destination for pilgrimage.

Siloam (Hebrew: Shiloah; Arabic: Silwan) is an ancient site in Jerusalem, located in the East Jerusalem neighborhood of Silwan, south of the Old City. According to the Hebrew Bible, Siloam was built around the "serpent-stone", Zoheleth, where Adonijah gave his feast in the time of Solomon. It is the site of the Pool of Siloam and the Tower of Siloam, both mentioned in the New Testament.
https://en.wikipedia.org/wiki/Siloam

Pool of Siloam (Hebrew: בריכת השילוח‎) (Breikhat Hashiloah) is a rock-cut pool on the southern slope of the City of David, the original site of Jerusalem, located outside the walls of the Old City to the southeast. The pool was fed by the waters of the Gihon Spring, carried there by two aqueducts.
https://en.wikipedia.org/wiki/Pool_of_Siloam