In SUPERMAN and its sequels (except for SUPERMAN III, in which it did not appear), the Fortress of Solitude is created by a crystal that Jor-El enclosed in Kal-El's spaceship. The crystal leads teenage Clark Kent to an ice field where, after he throws it down, it melts into the ice and grows into a huge crystalline building, similar to the crystalline architecture shown on Krypton at the beginning of the film. This Fortress contains numerous "memory crystals" that can be used to access Jor-El's artificial intelligence and hologram, interactiveholographic recordings of Lara, and other Kryptonians, and a chamber that uses red sun radiation to strip Kryptonians of their super powers. This incredible prop replica was made by hydin from the RPF.
