A few days ago I stumbled over a map which had beautifully rendered, detailed topographic tiles of the whole world. It was similar to google-physical with a strong contrast (shadow/light) and contour-lines. I do believe it was not from a commercial provider like ArcGIS but an open platform (Not sure though). I stumbled over it in relation to a search for openlayers. Unfortunately I missed to bookmark the site, I can't find the link in my history anymore. Does anyone know what I'm mumbling about or could post examples of topographic tiles which fit the description?
This question is very similar to what I'm looking for (And much better worded), but it's 2 years old and partly outdated