In addition to their service as a simple salt mine, the subterranean chambers of the Underground Salt Museum provide a stable temperature, humidity, and overall salt-heavy atmosphere ideal for slowing the biodegradation process and preventing everyday objects from crumbling into dust. To prove the point, one of their museum exhibits is a stand filled with vintage garbage, looking just as freshly disgusting as it did when Don Draper’s contemporaries first threw it all away decades ago.