A 3-D replica is a type of DIORAMA, which is a three-dimensional model of a landscape or scene. It is typically used to recreate a historical event or to represent a natural environment. Dioramas are often used in museums and educational settings to help visitors understand the context of the scene being represented. 3-D replicas can also be used for artistic purposes, such as creating a miniature version of a cityscape or other large-scale structure.