Nero's Golden Palace

Nero's Golden Palace is a location in Assassin's Creed: Brotherhood. It is underneath the Terme di Traiano and serves as a Lair of Romulus. The Palace is not optional, and serves as a mission during the first part of being in Rome.

History
Nero, one of Rome's first settlers, built this Palace underneath the Baths of Emperor Trajan to hide from the growing Templar rule. The stunning Palazzo had more than 500 rooms, none of them being bedrooms. After Nero died, the Followers of Romulus - a mysterious cult that worshipped one of the founders of Rome - began using it as a Lair to practice their cult.

Walkthrough
First, Ezio must climb up a few Columns and activate levers. With each Lever activated, more water will fill the pool, and at the last lever, one of the columns will give way and reveal a hole. Perform a Leap of Faith down the hole, then work your way through the section, climbing up the columns and scaling the walls. Eventually, you'll come across a chamber, there will be a cutscene showing another room in which a Follower of Romulus will punch a fellow member, sending him crashing down below. Work your way to a small hole at the top of the chamber, then jump across the columns and scale the walls to get to the balcony. Once inside the small room, loot the regular chests if you want to make a profit, then loot the big treasure chest and then exit the Lair by using the doorway.