Height of the Hoover dam wall

Height of the Hoover dam wall (221.4 m)

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Neat Ratios ...

Height of the Hoover dam wall (221.4 m)

is 1/100 of Height of Olympus Mons (Mars) (21.9 km)...more
is 1/50 of Depth of Marianas Trench (10.99 km)...more
is 1/40 of Height of Mount Everest (8.85 km)...more
is 1/25 of Height of Mons Huygens (highest point on the moon) (5.5 km)...more
is 2/5 of Height of the CN Tower in Toronto (553 m)...more
is 2 x Height of St Paul's Cathedral in London (111 m)...more
is 2 x Length of the Saturn V Apollo Program launch rocket (110.6 m)...more
is 2.5 x Height of the Flatiron Building in New York (87 m)...more
is 10 x Height of an All-Terrain Armored Transport (AT-AT) in Star Wars movies (22.5 m)...more
is 100 x Height of Chewbacca in the Star Wars movies (2.21 m)...more
is 200 x Height of the R2-D2 droid in the Star Wars movies (1.09 m)...more

If this was a standard unit ...