Abstract: An improved mausoleum and the method of construction, the mausoleum including a plurality of stacked, preformed, molded fiberglass or plastic crypts, interlocked together at crypt corners by metal fastening plates bolted to fastening rods partially embedded in the end faces of each crypt. Vertical columns of crypts are supported on a concrete or other conventional foundation. Each bottom crypt in a particular vertical column includes adjustable leveling supports to accommodate for variations in the surface of the foundation. A non-load bearing supporting shell or facade of decorative masonry or other material may be used to house an entire tier of crypts. Each crypt includes one or more vertically disposed, rigid supporting structural members embedded in each crypt side wall, the support member ends forming tenons which are interlocked with vertically adjacent crypt tenons to provide increased vertical compression force loading for the stacked vertical columns of crypts.