Is it possible to add historical posts to the map? I'd like to add these:

• Photography: Car and Stars and More stargazing photos from our January 5 trip to Tuckahoe State Park: southern horizon to zenith, both from Tuckahoe State Park in Maryland, USA
• The Striking Skies Above Cherry Springs which was from Cherry Springs State Park in Pennsylvania, USA. I don't own this Steem account, but I was also on that road trip.

I tried pinning the one from Cherry Springs to the map, but it doesn't seem like I did it right.

Edited to add: I think I get it now. I copied the code and added it to Photography: Car and Stars, but I don't see it on the map yet. How long does it take to refresh?