01
Building / Landmark
Castle Island
One of five peninsulas in Boston Harbor — an island until the causeway joined it to South Boston in 1928 — Castle Island holds the oldest fortified site in British North America, in use since 1634.
What does Castle Island reveal about the city?
One of five peninsulas in Boston Harbor — an island until the causeway joined it to South Boston in 1928 — Castle Island holds the oldest fortified site in British North America, in use since 1634.
Read the city asVisitorStart with what makes the place legible fast.StudentFollow campus rhythms, libraries, food, and late-night edges.LocalSurface the everyday rituals and quieter second looks.HistorianPrioritize older layers, people, and civic memory.Food loverLet restaurants, cafes, markets, and neighborhood rituals lead.ParentFavor safe, walkable, campus-adjacent understanding.ArchitectTrace buildings, campuses, edges, and visible civic form.RunnerRead the city through parks, paths, bridges, and distance.FounderFollow institutions, labs, companies, and invention spillover.
Open the connections
Why each step follows
Jump back in time
The older layer
Ask who shaped this