Number of hashtags: 4.1 million*
Most famous for: Caves and castles
Slovenia isn't typically the first place travelers think of when they think of bucket-list European countries, but it's steadily growing in popularity. The small Slavic nation located between Croatia and Austria — with a portion running along the western border of Italy — welcomed nearly 6 million visitors in 2018, an 8 percent increase from the year before.
Ljubljana is its capital, but nature is the real draw in this intimate country, which is why you'll find its coastline, lakes, rivers and mountains in many an Instagram post.
*To come up with our hashtag numbers, we added up Instagram posts tagged with #countryname, #countryname with flag, #countryname_ig and # countryname_insta.