Saint-Joseph-des-Fins Basilica is a 20th-century counterpoint to Annecy's older churches and lakefront prettiness. Begun in the 1930s and later raised to basilica status, it reflects the modern religious architecture associated with the monk-architect Dom Bellot.
It sits away from the most touristed old-town lanes, so it suits travellers interested in architecture more than those after Annecy's postcard views. The reinforced-concrete structure, stained glass, and scale make it a worthwhile detour if you have already seen the lake and castle.