A hypogeum or hypogaeum (/ˌhaɪpəˈdʒiːəm/ HY-pə-JEE-əm; plural hypogea or hypogaea; literally meaning "underground") is an underground temple or tomb.
Hypogea will often contain niches for cremated human remains or loculi for buried remains. Occasionally tombs of this type are referred to as built tombs.