Iguazu Falls (Iguassu or Iguacu) are the biggest waterfalls in the world. Iguazu falls consist of 275 separate falls and is actually bigger than Niagara Falls. It's located on the Border of Paraguay, Argentina and Brazil. (Photo by David Rochas).
There's a pink version of this photo going around as "Moss Bridges Ireland" or "Bridges Park, Ireland", but this is photo originally looks like this and is not from Ireland but from Saiho-ji Zen Garden in Kyoto Japan