Belgrave Square is one of London's largest 19th-century garden squares. In Syndicate it is the first stop in the main memory Family Politics, where Evie picks up a politician for Duleep Singh.
Before 1820 the land between London and Knightsbridge was swampy farmland known for dog fighting. The Grosvenor family developed it, and its houses drew ambassadors, politicians and Queen Victoria's mother.
Duleep Singh agrees to tell Evie where copies of the Buckingham Palace plans are, but only after she drives him around in a royal carriage so he can lobby politicians about the Punjab. Belgrave Square is the first pickup: a flustered politician whose own carriage is late climbs aboard, hears Duleep out on the broken treaty, and is dropped at Victoria station. Full sync asks you to steal the carriage without entering the depot courtyard and to keep its condition above half.
Buckingham Palace
Buckingham Palace is Queen Victoria's London home in Westminster and the setting for the climax of Syndicate's story, the Queen's ball. It is also where the Queen hands out the Operation side memories, and it has a viewpoint.
Buckingham Palace vault
The Buckingham Palace vault is a hidden crypt under the palace gardens that holds the Shroud of Eden, the Piece of Eden both the Assassins and Starrick are chasing in Syndicate. You finally reach it during A Night to Remember.
Palace of Westminster
The Palace of Westminster, home of Parliament, is in Westminster beside the Clock Tower. It has a viewpoint, Jacob assassinates the Earl of Cardigan here in Motion to Impeach, and the twins later stop a Templar bomb plot inside.
Sinopean Club
The Sinopean Club is a gentlemen's club for Disraeli, Gladstone and the Earl of Cardigan. Jacob infiltrates it in Playing Politics to learn who "B" is, and in Family Politics Evie drives Gladstone there in a stolen royal carriage.