From The Travel:
The world is a vast and amazing place, with countless wonders to see and experience. Many wonders are part of the natural structure of the earth, many are man-made wonders that have stood the test of time and continue to impress us to this day. From breathtaking waterfalls to towering structures to tropical islands stock full of unique wildlife, the world is full of countless wonders that will amaze you…
Niagara Falls is #10 on the list