

The Upper Room, or Cenacle, on Mount Zion is honored as the place where Jesus shared the Last Supper with his disciples and where the Holy Spirit came at Pentecost.
The room you visit today is a medieval hall, built by the Crusaders over the site long revered as the location of the upper room. It is simple and open, without decoration, which suits the weight of what happened here.
Two of the most important events in the Christian story are tied to this place, the first communion and the birth of the church.
Here Jesus shared the Last Supper and instituted communion, and here the Holy Spirit descended on the disciples at Pentecost.
At this table Jesus broke bread and said the words repeated at every communion since. "This is my body given for you." (Luke 22:19) Weeks later, in the same place, the Spirit came with wind and fire and the church was born. "All of them were filled with the Holy Spirit." (Acts 2:4)

On Mount Zion, just outside the Old City walls of Jerusalem, near the Tomb of David and the Church of the Dormition.
No. The original is long gone. The present hall is a Crusader-era structure built over the traditional site, kept simple and unadorned.
It is a shared public space, so quiet reflection is welcome, though formal services may be limited depending on the day and crowds.