A secret world is opening up beneath the twisting flagstone alleys of Jerusalem. Underground Jerusalem. This network of wide tunnels and narrow passages, the result of decades of archaeological digging, has allowed pilgrims visiting the Old City to descend into a parallel universe. They can now also walk on a wide Roman road on the very flagstones that Jesus and his disciples must also have trod on. New excavations are opening up a 2,000-year-old underground road that lies beneath Wadi Hilweh Street in the Palestinian neighbourhood of Silwan, leading from the Siloam Pool (where Jesus healed a blind man) to what the Jews call the Temple Mount and the Palestinians call the Haram al-Sharif.