Hello how may I help you? I have a couple of World Records questions I can help you with these world record questions. What do you wish to know? Where is the tallest indoor waterfall at and what's its name? The tallest indoor waterfall is in Singapore and is called the Mystic Dome Okay what's the tallest outdoor waterfall? The tallest outdoor waterfall is in Venezuela and is named Angel Falls. Thanks! No problem. Need to know something else? Nope Alright then. Have a nice day