Niagara Falls

The Niagara Falls are voluminous waterfalls on the Niagara River, straddling the international border between the Canadian province of Ontario and the U.S.
Eventually these were reduced to one, the original Niagara Falls, at Queenston-

Lewiston. From here the Falls began its steady erosion through the bedrock. ...

Underground River Palawan

The Puerto Princesa Subterranean River National Park (PPSRNP) is one of the most important biodiversity conservation areas of the Philippines. It features a spectacular limestone or karst landscape that contains an 8.2 km long underground river.

                                                                Pagsanjan Falls
Pagsanjan Falls is located south of Metro Manila in the province of Laguna. The place is very popular among domestic and international travelers. Shooting the rapids is its major attraction.

       Iguazu Falls  
Iguazu Falls are waterfalls of the Iguazu River located on the border of the Brazilian State of Paraná and the Argentine.  one of the top destinations in South America. Taller than Niagara Falls, the water level rises and falls with the season.