The Königsbrünnchen in Frankfurt's city forest

The Königsbrünnchen is a natural spring in Frankfurt's city forest. Although it may not be an actual sight it's nice to have a quick stop there and refresh if you happen to be visiting the forest. Its water is very rich in iron, so the rocks are rusty-coloured and you can smell the spring from a bit further away. The taste is something that some people will need some time to get used to, but the main attraction about it is maybe that Goethe, one of Germany's biggest names in poetry and writing, used to stop for a drink there. So as far as I am concerned, if it's good enough for him it's good enough for me :)