St. Catherine's Pool, Eskdale, West Lake District, UK.

"St. Catherine’s pool is probably the best kept secret in all of the Lake District," according to Russell Sheldrake, Syndication Fellow at Business Insider. "Only accessible on foot as you walk past St. Catherine’s church near Eskdale, you eventually get to a widening in the river Esk where the water comes to a standstill and a big rock protrudes out of the water. It's perfect for a quick, refreshing dip on the occasional hot days that come fairly few and far between in this corner of northern England. The beach itself is very small yet has a hidden charm that very few places still do."