 The northwestern section is roofed on three sides, the central area and north eastern side being open to the sky; the southeastern section is fully roofed, the roof being supported by four columns evenly distributed through the section.Nearly the entire building itself was built by King Herod and it remains the only Herodian building surviving today virtually intact.In the northwestern section are four cenotaphs, each housed in a separate octagonal room, those dedicated to Jacob and Leah being on the northwest, and those to Abraham and Sarah on the southeast.