I don’t follow many Instagram accounts because I don’t spend that much time on Instagram.
One of my favourites is trip_finest. It is a teeny tiny account that curates (and credits) beautiful destination photographs. So you can clickthrough the credit and get little tastes of other travel accounts. I find the photographs trip-finest posts very soothing and through them have found other accounts to follow. They also carefully and respectfully curate the photographs they post so you are not bombarded with photos posted just for likes and follows.
