Brazil, Iguazu Falls, Elevated view of the waterfalls.

Iceland, Southwest, Gullfoss Waterfall and Gullfoss Gorge, on the Hvita River.

Iceland, Southwest, Gullfoss Waterfall and Gullfoss Gorge, on the Hvita River.

USA, New York City, Manhattan, New York Fire Department Memorial Wall, Engine 10, Ladder 10, World Trade Center.

USA, New York City, Manhattan, One of the two waterfalls at National September 11 Memorial, World Trade Center.

USA, New York City, Manhattan, One of the two waterfalls at National September 11 Memorial, World Trade Center.

USA, New York City, Manhattan, Four World Trade Center also known as Tower 4 and 150 Greenwich Street.

USA, New York City, Manhattan, One of the two waterfalls at National September 11 Memorial, World Trade Center.

USA, New York City, Manhattan, One of the two waterfalls at National September 11 Memorial, World Trade Center.

USA, New York City, Manhattan, One of the two waterfalls at National September 11 Memorial, World Trade Center.

USA, New York City, Manhattan, One of the two waterfalls at National September 11 Memorial, World Trade Center.

Norway, Golsjuvet, Frozen waterfalls with frozen river in foreground at climbing area close to Gol.