Whitehall is the street of government offices in Westminster, named after the vanished Palace of Whitehall. The Admiralty, Horse Guards, Foreign Office, Scotland Office and 10 Downing Street all sit along it.
Henry VIII moved the royal residence here from the Palace of Westminster in 1530, and it stayed the monarchs' home until fire destroyed most of it in 1698. The Banqueting Hall is what survives.
Walking Whitehall lets you tick off a run of database landmarks in one go: the Admiralty, Horse Guards, the Foreign Office, Dover House (the Scotland Office), Montagu House, the Banqueting Hall and 10 Downing Street.
10 Downing Street
10 Downing Street is the Prime Minister's home and office in Westminster. In 1868 Benjamin Disraeli lives here, and Jacob's work as his bodyguard in Sequence 7 starts outside the house.
Admiralty
The Admiralty is a government office on Whitehall in Westminster, one of the period buildings you can climb and read about in the in-game database. No memory centres on it.
Banqueting Hall
The Banqueting Hall, later the Chapel Royal, is a 1622 hall on Whitehall in Westminster and a database landmark in Syndicate. It is the only surviving part of the old Palace of Whitehall.
Blue Anchor Alley
Blue Anchor Alley is a Blighter stronghold in Westminster run under Lilla Graves, one of two in that borough. Freeing it lets the Rooks set up there instead.