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.
Tess and Ellie crawl through a gap that collapses behind them, leaving Joel alone with clickers. He finds them again behind a door a runner is attacking, and the three fight off a crowd of infected before climbing to the roof.
During the museum fight Tess is bitten, though Joel and Ellie do not learn this until they reach the Capitol Building.
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.
Boston slums
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.
The Goldstone Building
The Goldstone Building is a damaged downtown Boston skyscraper that Joel, Tess and Ellie climb through in the Downtown section of The Outskirts, because a chasm blocks the street. It is packed with infected, including stalkers, runners and clickers.
Liberty Gardens
Liberty Gardens is an abandoned two-level mall in Boston where Ellie and Riley spend a night together in Left Behind's flashback chapters. You explore it in Mallrats and Fun and Games, and it gives the final chapter, Escape from Liberty Gardens, its name.