Iceland, Gullbringu, Blue Lagoon, People bathing in the warm water beside the thermal powere station at Svartsengi.

Iceland, Gullbringu, Blue Lagoon, Svartsengi power station with swimmers in thermal heated pool.

Iceland, Gullbringu, The Blue Lagoon, Swimmers in the water beside the thermal power station at Svartsengi.

England, Kent, Sevenoaks, Fire and Rescue team on training exercise, thermal imaging camera.

England, Kent, Sevenoaks, Fire and Rescue team on training exercise, thermal imaging camera.

Food, Cooked, Vegetables, Green mushy peas in an insulated polystyrene foam container on a white background.

Hungary, Budapest, Lion fountain in central Pest.

Hungary, Budapest, Lion fountain in central Pest.

Hungary, Budapest, Pest, Male bathers playing cards in summer at Szechenyi thermal baths, largest in Europe.

Hungary, Budapest, Pest, Bathers playing chess in summer at Szechenyi thermal baths, largest in Europe.

Hungary, Budapest, Pest, Outdoor bathing in summer at Szechenyi thermal baths, largest in Europe.

Hungary, Budapest, Pest, Mixed group outdoor bathing in summer at Szechenyi thermal baths, largest in Europe.