The air becomes warm as you travel deeper into the earth. You reach a point in the tunnel where the angle allows you to see a pit glowing red hot and fuming at the bottom of the decline. Cautiously you approach the edge of the pit and peer in – a bubbling, hissing, pool of molten lava. A narrow path leads around the pit; you follow it to arrive at a solid iron gate built into the stone. There is theater masks and some Greek text engraved into the archway above the gate – ιαχή.