SortStack #2904 — 2034-05-22

By size · Order from shortest to longest.

1. A skateboard 79 cm

   The kicktail that makes tricks possible was a 1970s accident that turned skating into an aerial sport.

2. The Leaning Tower of Pisa 58 m

   It began tilting during construction in the 1170s because of soft ground, and engineers only stabilised it in 2001.

3. A tower of the Golden Gate Bridge 227 m

   The bridge's 'International Orange' colour was chosen partly because it stays visible in San Francisco's thick fog.

4. The Verrazzano-Narrows Bridge (main span) 1.3 km

   Its towers are slightly farther apart at the top than the bottom because they must follow Earth's curvature.

5. The Kiel Canal, Germany 98 km

   The world's busiest artificial waterway, it lets ships skip the long, stormy voyage around Denmark.

6. The Grand Canyon (length) 446 km

   The Colorado River carved it over millions of years, exposing rock layers nearly two billion years old at the bottom.

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