If the Axenstrasse had been built today, it would probably be declared impossible. It runs along the cliffs of the Urnersee, with the lake directly below and rock walls climbing above, and it was cut in the 1860s when engineers still believed in pickaxes and gunpowder. Its main purpose was to link the Gotthard corridor to central Switzerland without relying on lake steamers. The tunnels and galleries along the route were chiselled out by hand, and the carved portals are among the nicest bits of old infrastructure you will see.
This is the stretch where the mountain wins. The road clings to ledges, dips into short tunnels with windows opening onto the water, and bursts out into sunshine with a view straight across to the Uri Alps. Near the northern end the famous chapel dedicated to William Tell sits at the water's edge, which can be reached by boat or on foot. Whether Tell existed is a matter for historians. The scenery here is real and the legend belongs to the place, and in Altdorf, a few minutes down the road, a statue of the archer and his son stands in the square.
The riding is slow and thoughtful. The speed limit is low, the bends are tight, and the tunnels demand attention. Mid-morning sun lights the opposite shore, and evenings give a golden glow on the western cliffs. Winter ice can linger in shaded galleries, and spring rains sometimes loosen stones from the slope above. Treat any warning sign seriously, and expect that the road can close for rock-clearing.
For fuel and supplies, Ingenbohl and Brunnen at the southern end of the lake are the nearest, and the Uri side has stations around Flüelen and Altdorf. There are viewpoints and a few restaurants along the way, though some are seasonal. If you want a quiet moment, look for a lay-by where you can stop out of the traffic, remove your helmet and listen. The lake is so deep and still that sound seems to fall away.
The return is as good as the outward leg. With the sun in a different position, the whole view looks new, and you will catch details you missed on the first pass.