Monolith

A Monolith is a rock consisting of the same material.The famous monolith from 2001:Space Odyssey and its sequels were build by an ancient,interstellar alien civilization known as the Firstborn,who build the monoliths to help creatures to achieve sapience.Intelligent victims of the monoliths were transported in an extradimensional place and aged fast as seen in the end of the 2001 movie.