What is the term for the structure containing niches for holding cremated remains?

The term for the structure that contains niches specifically designed for holding cremated remains is a columbarium. A columbarium is typically a wall or building that offers a respectful and permanent place for the ashes of individuals who have been cremated. Each niche can hold an urn containing the cremated remains, allowing families to memorialize their loved ones in a dedicated space.

Mausoleums, while also used for interment, are generally larger structures designed for entombing the deceased, often in caskets, and may not specifically cater to cremated remains. Chapels serve as spaces for conducting funeral services and may include areas for viewing or prayer, but they do not function primarily as storage for cremated remains. Cemeteries are broader landscapes designated for burial of bodies and may contain various memorialization options, but they do not specifically refer to structures for holding cremated remains.

Thus, the columbarium is the correct term in this context because it directly pertains to the storage and memorialization of cremated remains.