Human-defined Scales and Structures
- 18 km — cruising altitude of Concorde
- 27 km — circumference of the Large Hadron Collider, as of May 2010 the largest and highest energy particle accelerator
- 30 km — length of the longest man made dike enclosed by water on two sides, the Afsluitdijk.
- 31.3 km — highest parachute jump (Joseph Kittinger)
- 34.668 km — highest manned balloon flight (Malcolm D. Ross and Victor E. Prather on May 4, 1961)
- 38.422 km — length of the Second Lake Pontchartrain Causeway in Louisiana, US
- 39 km — undersea portion of the Channel tunnel
- 53.9 km — length of the Seikan Tunnel, as of October 2009, the longest rail tunnel in the world.
- 77.1 km — total length of the Panama Canal
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Famous quotes containing the words scales and/or structures:
“For these have governed in our lives,
And see how men have warred.
The Cross, the Crown, the Scales may all
As well have been the Sword.”
—Robert Frost (1874–1963)
“The American who has been confined, in his own country, to the sight of buildings designed after foreign models, is surprised on entering York Minster or St. Peter’s at Rome, by the feeling that these structures are imitations also,—faint copies of an invisible archetype.”
—Ralph Waldo Emerson (1803–1882)