Bergen bored 2.9 kilometres through a mountain in 2023 and gave the whole thing to people on foot and on bikes — separate lanes, no cars at any point. Colour-changing light runs the length of it and shifts as you ride, and halfway in the bore widens into a hall to stop in. In a city that rains most of the year, the shortcut between two valleys is also the only dry commute in town. Closed 23:30 to 05:30.