Height of the US Presidents' heads carved into Mount Rushmore

Height of the US Presidents' heads carved into Mount Rushmore (18 m)

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If Height of the US Presidents' heads carved into Mount Rushmore (18 m) was a standard unit ...

Height of Mount Everest (8.85 km)...more would be 500 x Height of the US Presidents' heads carved into Mount Rushmore
Height of the Tres Hermanas waterall in Peru (914 m)...more would be 50 x Height of the US Presidents' heads carved into Mount Rushmore
Height of the Taj Mahal in Agra, India (73 m)...more would be 4 x Height of the US Presidents' heads carved into Mount Rushmore
Length of the SpaceX Falcon 9 launch rocket (71 m)...more would be 4 x Height of the US Presidents' heads carved into Mount Rushmore