A mausoleum refers to a building constructed to hold crypt above ground, rather than a traditional cemetery. Mausolea can be individual, freestanding buildings, or they can be part of a larger facility, such as a church.
Sam and Dean find the mausoleum, only to discover that Isaiah Merchant’s body is not there, only four glass cases of mementos behind four urns. Later, Dean returns to the mausoleum to burn the doll from one of the cases.
Sam and Dean search the crypt of Our Lady of Angels church, where Sam and Dean find wormwood growing on Father Thomas Gregory's tomb. Sam later summons Fr. Gregory's spirit, who is convinced by Father Reynolds that he is not an angel and to move on and be at peace.
Cole receives helmet cam footage of Kit Verson's rescue mission extracting POW's from Najaf Cemetery in Iraq. In the video, the camera shows two soldiers enter a mausoleum and find the soldier they were supposed to rescue, who aggressively attacks them.
Maggie is sent on her first solo hunt to Claremore, Oklahoma, where at the Rawling personal cemetery, a ghoul had supposedly attacked some teens drinking at the mausoleum. Upon entering, she is attacked by a nightmare creature.