The Guardian of the Temple, Dynamis

Gingka launches Big Bang Pegasus through a wall and breaks it, leaving a path out of the labyrinth. Suddenly they hear a mysterious voice and the dull, grey clouds come apart to reveal a clear blue sky and ruins, which are set up similarly to Stonehenge. Gingka then notices the temple behind it, which has a large, black door.

Synopsis excerpt via Kitsu.