The Boston slums, marked Area 5 on military maps, are the poor district of the Boston quarantine zone where the smugglers run an open black market. You walk through them in The Slums section of The Quarantine Zone while hunting the smuggler Robert.
Joel and Tess bribe their way in, push past the market stalls and a crowd around a fistfight, and learn from a guard that Robert has run to the wharf. Both the Drafting notice and the Wanted poster lie just past the bus where Malick confronts you.
People in the slums are rougher than in the upper areas and wary of strangers. Robert used to hide in Area 2 before falling back to the warehouse and wharf. Soldiers rarely come in unless they hear gunfire.
Quarantine zone
Quarantine zones are the walled, military-run safe areas FEDRA set up across the United States after martial law was declared. Most have since fallen to infection, revolt or abandonment. Boston's North End zone is the one you live in and play through at the start of Part I, and you pass the dead zones of Pittsburgh and Salt Lake City later.
Mission Hill Pier
Mission Hill Pier is the wharf in the Boston slums where the smuggler Robert runs his trade. Joel and Tess fight through Robert's men here at the end of The Slums section of The Quarantine Zone, then chase him through the area.
Freedom Museum of Boston
The Freedom Museum of Boston is a history museum about the American Revolutionary War that Joel, Tess and Ellie cut through in the Museum section of The Outskirts. A wave of infected chases them inside, and you fight clickers and runners through its exhibits.
Massachusetts State House
The Massachusetts State House, usually called the Capitol Building in the game, is where Marlene sends Joel and Tess to hand Ellie to a waiting Firefly group. It is the goal of The Outskirts and gives the chapter's last section its name.