Historic Environment Scotland manages 300 sites across the country. Overall, there has been a significant 17% increase on 2016/17 in the 2017/18 figures passing the 5 million mile-stone. Within this however, there have been even more dramatic increases from some countries and to certain attractions. Visits from North America went up by 27% and 19% respectively. This has been attributed to Outlander.
https://thoughtcontrolscotland.com/2018/04/18/17-increase-in-visits-to-scotlands-historic-attractions-with-massive-outlander-effect/