The Herodium is on top of a mountain that Herod the Great had leveled and tunneled out to house one of his summer palaces. From a distance, the mountain looks like a volcano. The columns in the foregroud are the ruins of a large swimming pool at the base of the mountain.
We were able to drive about halfway up the mountain and then walked the rest of the way up. Coming down, we came down through the tunnels leading through the water cisterns and came out of the mountain just above where they just discovered Herod's Tomb.
The "dig" at Herod's Tomb