Castle Penatha

Castle Penatha was originally built in the World's Edge Mountains in Qadira, but disappeared down to its foundation around 4691 AR. Its fate remained unknown until it suddenly reappeared completely intact—with the addition of a tower with a golden cupola—near the summit of Mount Rectzaid, in the mountains of the Ustalavic county of Ulcazar. It is now said to be the home of Isla Bellsan, the purple-cloaked, self-proclaimed greatest thief in Avistan.

References

For additional as-yet unincorporated sources about this subject, see the Meta page.