Underground Chapel (Anime)

The Underground Chapel is located beneath a chapel in a village near the Reiss family estate. It is a sacred location and the walls are composed of a luminescent ore that is thought to have been created by some form of Titan power.

The Uprising arc
After having a vision of Frieda Reiss, Eren Jaeger wakes to discover himself gagged and restrained on a platform overlooking a large crystal cavern. He spots Historia approaching below him while wearing a pure white dress.