The Hospital is a building in Athyras. It was edited into the world from schematic using MCEdit by Fegelein1906 back when he was still owner of the server. It doesn't count as one of his builds due to this. The origin of the schematic and the original author is unknown.
The building is notoriously known for it's huge size and labyrinthine interiors. Some players joked that once you get inside, you'll be trapped forever.