Nidaros Cathedral and the Archbishop's Palace — Norway's single most important church rises over the river at the south end of Midtbyen: the northernmost medieval cathedral in the world, a great Gothic pile built over the burial place of St Olav, King Olav II, whose grave made this the goal of northern pilgrims and the coronation church of Norwegian monarchs. Stand under the ornate west front, studded with row upon row of carved statues, then go inside for the soaring nave and the rose window, and out to the neighbouring Archbishop's Palace, the oldest secular building in the Nordic countries, with its museum of cathedral stonework and the crown jewels. It is the reason Trondheim exists, and it still anchors the whole city.
Bakklandet and the Old Town Bridge — Cross the Nidelva on the Gamle Bybro, the Old Town Bridge, through its red-painted wooden gate-portals — the "Portal of Happiness" (Lykkens Portal) — and you land in Bakklandet, the loveliest quarter in Trondheim. Narrow cobbled lanes of small painted timber houses run along the east bank, thick with coffee houses, tiny shops and riverside terraces. The bridge itself gives the classic view: the stilted wharves marching down the river on both banks, mirrored in the water. Wander the lanes with no plan, stop for a cinnamon bun and a coffee, and let the day go slowly — this is a walking, sitting, watching kind of city.
Up to Kristiansten for the view — From Bakklandet a short steep climb leads up to Kristiansten Fortress, a compact 17th-century star fort on the hill that once defended the town from the east. The ramparts give the widest view in Trondheim: the whole peninsula laid out below, the cathedral spire and the river wharves, the fjord opening out beyond. If the walk up feels steep, the Trampe bicycle lift — the quirky Sykkelheisen that pushes cyclists up the Brubakken hill by Bakklandet, reputedly the only one of its kind in the world — hints at just how sharply the ground rises here.
The city's museums and music — Trondheim keeps its stories in some fine museums. The Ringve Music Museum, in a manor and gardens out on the Lade peninsula, holds instruments from around the world; Rockheim, the national museum of pop and rock down by the harbour, tells the story of Norwegian popular music in a landmark box over the water. In the centre, the Stiftsgården — one of the largest wooden palaces in Scandinavia and a royal residence — opens for tours in summer, and the Archbishop's Palace museum sits beside the cathedral. Between them they cover the whole arc, from medieval stone to electric guitars.
Café life along the river — For all its Viking weight, everyday Trondheim runs on coffee and the water. The student population fills a café and food scene that is, for Norway, genuinely affordable, and the best of it clusters in Bakklandet and along the Nidelva. Take a bench by the river, hire a bike and glide the flat lanes and the riverside paths, or simply drift between the wharves and the wooden lanes with a paper cup in hand. In the long light of a Trøndelag summer evening — near-endless in June, if never quite the true midnight sun of the far north — the river city is at its most likeable.