Tom Scott, the famous world traveler who shows us amazing places around the world, is concerned about becoming "that weird elevator guy" because he has made many videos about unusual elevator designs. But his fans have insisted that he explore a particular elevator in Hanover, Germany. The shaft of this elevator is curved.
The town hall is unusual because it has a dome, which is not the norm in Germany. The elevator and the building were constructed in 1913, but I gather that the architectural plan did not call for an elevator. So the builders had to find a way to locate a shaft in a convenient place.
That meant the cupola, which has a curved shape at the top. The track bends and the elevator follows this track precisely, sometimes coming within 5 mm of the walls.