Some of the most fascinating natural phenomena in the world are waterfalls. Cascading over and through the geological remnants of the earth's history, the water of the world falls, creating the familiar sounds of gurgling, crashing water. This topic in depth takes you on a tour of a few great websites devoted to waterfalls around the world and the U.S. The World Waterfall Database (1) site, from Bryan Swan and Dean Goss -- waterfall aficionados -- contains all sorts of great information about waterfalls of the world. They even include listings of the biggest falls, divided between the tallest and the most volume. The second (2) site, again from a waterfall aficionado, Robert Glaubitz, highlights the waterfalls of the eastern U.S. The third (3) site, from Niagarafallslive, features all sorts of great information about the several smaller falls that collectively make up Niagara Falls. Be sure to check out the live webcam of the falls. The fourth (4) site from National Geographic, includes a great story about a lost waterfall in Tibet. The final site, Waterfalls of Western North America, (5) website is offered by Dr. Stephen K. Wagner at Michigan State University. The site is an unbelievably well organized tour of the waterfalls of the U.S.