In 2003 remodelling of the ground-level visitor facilities took place to create a new visitor entrance and make the crypt accessible to disabled visitors. The visitor route was also changed so that visitors now see the tombs in historical sequence by entering at one end and leaving at the other, instead of both entering and leaving via a single stairway that is in the middle of the route. Most importantly, the entire crypt was air conditioned so that humidity can be controlled.