Nidaros Cathedral Official Norway's national sanctuary—Gothic, crown jewels (€12 combo).
Archbishop's Palace Museum Official Medieval residence—crown regalia (€12 combo).
Trondheim Old Town & Wooden Bridge Free Colorful warehouses—Gamle Bybro (free).
Rockheim National Museum of Pop Music Official Interactive Norwegian music (€16).
Ringve Music Museum Official Instruments, concerts (€12).
Kristiansten Fortress Free 17th-century—city views (free).
Stiftsgården Royal Residence Free Exterior Nordic largest wooden palace (free).
Trondheim Maritime Museum Official Boats, diving (€10).
NTNU University Museum Official Natural & cultural history (€10).
Sverresborg Trøndelag Folk Museum Official Open-air—130 buildings (€15).
Bakklandet Neighborhood Free Wooden houses, cafes—cycling (free).
Munkholmen Island Boat Official Monastery/prison—swimming (€15 roundtrip).