Unbelievable Places-Fly Geyser, Nevada, manmade and created by accident. In 1912 a geothermal well was drilled and in 1960 geothermally heated water found a crack and erupted, it's been spewing hot water up to 5' high ever since, growing and forming.
Gallium- It has a melting temperature of about 85 degrees Fahrenheit, which is basically room temperature. If you hold this metal it will begin to melt in your hand.