Alter Elbtunnel
A 426-meter tunnel built in 1911 that still carries pedestrians and cyclists 24 meters beneath the Elbe, free and open around the clock — tiled walls, antique elevators, and a container-ship view at either end.
Opened in 1911 to carry dockworkers under the river to the shipyards, the St.-Pauli-Elbtunnel was an engineering marvel of its day — a tiled, vaulted tube running 24 meters below the Elbe, originally built for horse-drawn carts as much as people.
It's still fully functional today: pedestrians and cyclists cross for free, any time, descending via the same ornate century-old glass elevators that carried the first dockworkers, or a spiral staircase for those who prefer it.
At the Steinwerder end, a small platform gives an unusually close view of container ships and working cranes across the water — a genuine working-harbor perspective a few minutes' walk from the tourist crowds at Landungsbrücken.
Why it's a secret
Most visitors photograph the tunnel's ornate entrance building from outside and never realize it's a fully open, free pedestrian route that's been running under the river for over a century.
How to get there
The entrance is at the St. Pauli Landungsbrücken, right by the Landungsbrücken U-Bahn/S-Bahn station.