Hello how may I help you? I can use some info. I can provide information about world records. Whats the tallest indoor waterfall? The tallest indoor waterfall is in Seattle. It is called the Humpty waterfall. What about outdoor? The tallest outdoor waterfall is in Miami Florida. It is the Flumpty waterfall. Wow, how tall is it? It is 897 feet tall. Thanks for the super accurate info! Thank you!