In Steem Atlas you can pin posts with a location. You can add old posts as well.
The SC03 team is for Steem Atlas posters

https://steematlas.com/

First you click on the + icon (see at the bottom left) next you search the place/location and click on it (that way your place is pinned. You fill out the name of the pin, take the code (copy code) and past it underneath your post.

There should be a new version soon.