[
The Mirror] An underground pyramid from 500BC and suspected of containing untold treasures has been found near a Celtic tomb raided by Heinrich Himmler.The SS chief, obsessed with Celtic mysticism, stole golden artefacts from an ancient tomb of a noble couple in Buehl, South West Germany. The loot, thought to be worth £500million, was never seen again. But now archaeologists are excited by a nearby Iron Age burial chamber that is even bigger at 18 square feet, probably the grave of a great chieftain