When browsing the world map I noticed this:
What does the white circle around the location means? Hovering it shows the ordinary details.
Background: I visited the location a while back (both game time and real time) and after not finding the hidden treasure, gave up and forgot about it. (Until seeing it now again. :))
Best Answer
The circle highlight appears once you have been close enough to the place to identify what it is but you haven't yet actually collected all the loot.
The circle disappears and the place appears grey once you have got all the loot.