The Devil's Acre is a slum in Westminster and Lilla Graves' Blighter stronghold, described in game as the most violent stronghold in London. It also features in the main story when Jacob escorts Mary Anne Disraeli through it.
Since medieval times the area, then under Westminster Abbey, sheltered criminals and debtors. Its closeness to the Abbey and Parliament made it a favourite cause for London's philanthropists.
Clear Graves' Blighters in the Devil's Acre stronghold memory to turn it over to the Rooks.
In The Bodyguard, Mary Anne Disraeli agrees to help Jacob find the mysterious "B" if he shows her the Devil's Acre. Driving Mrs. Disraeli is that tour, carriage and all.
Reporters hunting a scandal nearly derail the outing, so the memory has you draw them off before Mary Anne can go in. At the One Tun pub a Blighter called John the Tosser snatches her dog Desmond, and Jacob has to chase him down. The memory follows The Bodyguard and leads into Change of Plans.
Maxwell Roth's gang got its start in this slum before spreading across every borough, which is part of why the stronghold here is described as the most violent in London.
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.