Location from My Little Pony: Friendship Is Magic by Hasbro / Lauren Faust
The ancient royal palace where Luna became Nightmare Moon — abandoned for a thousand years in the heart of the Everfree Forest.
The Castle of the Two Sisters is the most haunted place in Equestria — not by ghosts, but by history. This is where Celestia and Luna ruled together before the rift. This is where Luna's jealousy boiled over into Nightmare Moon. This is where Celestia made the decision to banish her own sister. The forest has been reclaiming it for a millennium. The halls echo with wind that sounds like whispers. The old library still holds readable books. It's a place that makes everypony who visits feel the weight of choices that changed the world.
A crumbling stone castle overtaken by forest growth. Towers lean at precarious angles. Vines crawl through shattered windows. The throne room still has two thrones — one for the sun, one for the moon — covered in dust and moss. Despite the ruin, fragments of former grandeur remain in the stonework and faded tapestries.
Also known as: Castle of the Two Sisters, the old castle, the ancient castle