The Rookery contains the Whitechapel Assassin headquarters in Assassin's Creed Syndicate.
The Rookery is a dilapidated urban building that serves as the Frye twins' early base of operations in Victorian London. Jacob and Evie Frye use it while building alliances, recruiting the Rooks, and challenging Templar control over the city's districts.
Syndicate divides London into districts including Whitechapel, the City of London, Westminster, Southwark, Lambeth, and others. The Rookery is tied to the Whitechapel district and reflects the game's depiction of overcrowded housing and sharp social inequality during the Industrial Revolution.
It is not a royal or religious landmark. The Tower of London, Buckingham Palace, and Westminster Abbey are recognizable real locations represented elsewhere in the game's London map, but none is the twins' Whitechapel headquarters.