Superlative

I spent today researching and trying-out my next "superlative" walk. Three friends and I get together once a month for a walk. We take turns to plan the route. An aim for each one is to include at least one superlative. This picture shows one of (at least) four superlatives for the walk I am planning for February. I will give no clues but if anyone can guess what or where it is I will be most impressed.