This isn't photoshopped - this lake really is bright pink. Lake Hillier is a saline lake off Western Australia's southern coast.
The best way to visit the lake is by helicopter. Its bubblegum pink hue is caused by organisms in the water.
Dunaliella salina is a microorganism that creates a red dye. Red halophilic bacteria is also found in the lake's salty waters.
A scientific explanation for something totally magical.