Castle of Two Sisters

The Castle of Two Sisters was the first castle lived in by Princess Celestia and Princess Luna.

History
The castle was built in the Everfree Forest, presumably due to the magical nature of the place. The castle was at some point abandoned long before the Founding of Ponyville as he two sisters isntead moved to Canterlot Castle. After an incident involving living plants, Twilight Sparkle and her friends were tasked with remodeling the castle, though not much ever came from that.

It was theorized that the Pony of Shadows lived within its hall.

The Mane Six organized their Nightmare Night trick by sending the Young Six to the castle but after realizing how dangerous their pranks were, they rushed in the castle to save them, only to realize the kids already saved themselves.

Appearances

 * "Princess Twilight"
 * "Castle Mane-ia"