Città Alta preserves street alignments, civic buildings and churches inside a defensive perimeter greatly expanded under Venetian rule. The walls are both engineered military landscape and today’s public edge.
Piazza Vecchia, Santa Maria Maggiore and the Colleoni Chapel bring communal government, church power and elite commemoration into one small area, while Accademia Carrara shifts attention toward collection and public education.
Crespi d’Adda must be read through factory, housing, services, cemetery and river power as one paternalist company system. UNESCO status does not turn the village into an empty museum.
Give Bergamo a full day and Crespi a separate half or full day; the funicular and river approaches are useful transport, not substitutes for reading terrain.