Hi
@ksemi!
Unfortunately, I hate to be the bearer of bad news, but if its showing blank there isn't a way to make it reappear. Are your settings properly turned on, and have you updated to the most recent version of iOS? I know early on in iOS 10 there were some issues with the frequent location service. This has supposedly been fixed in the last few releases.
Settings > Location Services > System Services > Frequent Locations (toggle set to on)
Did you happen to use any map apps to reach that location 2 weeks ago? This could be something you might be able to pull some history from as well.