Hunvar's Spire
From Wookieepedia, the Star Wars wiki.
Hunvar's Spire was the headquarters of the Hutt slaver Hunvar, based in Kala'uun on Ryloth. The floor of the dining hall had a hole through which spectators could watch slaves engaged in combat for their entertainment. The upper floors contained Hunvar's living suite, personal treasury, and a well-stocked armory for his guards and jailers.
The Spire was rumored to contain a lost Jedi holocron, but this was in fact a hoax promulgated by slavery opponents in an attempt to lure Jedi or treasure-seekers to raid the Spire and publicize the plight of enslaved Twi'lek females.
