Today I bicycled about 6 km each way, from the German Colony (where I live) along the old train tracks to Ein Henya, a spring in the valley of Nahal Refaim, south of Jerusalem. Ein Henya is being developed as part of the new Jerusalem Park, 4 parks that form a greenbelt that extends over some 1,500 hectares (3700 acres), surrounding the city to the north, west, and south. They are still working on parking, landscaping, etc. at Ein Henya but you can visit.
I spoke to the supervisor and he said it would be about another 6 months before they’re finished and they are still discussing whether to fill the two pools when they are done (currently the water is flowing but rerouted and the pools are empty). So for the time being you will have to find other springs and pools in the area to enjoy.
The spring is typical of those found in the Jerusalem area, consisting of a dugout chamber on the side of the hill where the water flows through the water porous limestone layer and comes out when it reaches a layer of marl and clay that is more impervious to water.
A 39 meter underground tunnel channels the water to the ruins of a building, the apse of a 6th C Byzantine church, where it cascades down into a small pool in front of the apse framed by two pilasters. The apse gave the spring its Arabic name because henya is a round niche carved out of stone.
One tradition is that the church is named after Philip the Evangelist according to the story in Acts 8:26-40.
Then an angel of the Lord said to Philip, “Go south to the road—the desert road—that goes down from Jerusalem to Gaza.”
There he met a court official of the Queen of Ethiopia in charge of her entire treasury who was sitting in his chariot reading from the prophet Isaiah. He had come to Jerusalem to worship at the Temple and was returning home. The official/eunuch asked Philip to explain what was written and was so moved that when they came to the spring he requested that Philip baptize him there.
For another possible site where Philip could have baptized the Ethiopian see Ferrell Jenkin’s post.