Extensive remains of the bath site which included changing rooms, hot rooms and cold plunge pools, on the edge of what is now the River North Tyne, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Tolmer Falls with deep plunge pool, Litchfield National Park, near Darwin, Northern Territory, Australia, Pacific

A hill walker taking a dip in a mountsain stream above Glen Nevis, Scotland, United Kingdom, Europe

A man leaps into a plunge pool below a waterfall on the side of Ben Starav, a Munro in the Highlands, Scotland, United Kingdom, Europe

A waterfall and plunge pool on the side of Ben Starav, a Munro in the Highlands, Scotland, United Kingdom, Europe

A waterfall and plunge pool on the side of Ben Starav, a Munro in the Highlands, Scotland, United Kingdom, Europe

Little boy with swimming goggles, jumping into swimming pool, underwater, Ukraine, Europe

Face Plunge

Family enjoying swimming in a natural pool under a plunging waterfall along the Road to Hana, Maui, Hawaii, United States of America

Kirkjufellsfoss Falls, Grundarfjordur, Snaefellsnes, Iceland

WEST INDIES Dominica Emerald Pool Waterfall and plunge pool in thick tropical rainforest.