4. Victoria Falls, Zimbabwe and Zambia.Victoria Falls is considered one of the seven natural wonders of the world. The waterfall which is part of the Zambezi River is located on the border between Zimbabwe and Zambia. Although it is not the highest or the widest in the world, it is still recognized as the largest because of its combined width and height. At 354 feet high, this waterfall is almost twice the height of Niagara Falls in America. Victoria Falls is 1,708 feet wide and this is more than twice as wide as the Horseshoe Falls. The falls were already attracting 400,000 visitors each year by the end of the 1990s and is expected to attract about a million visitors each year in the next ten years.