Existing
There are structures that may be considered megastructures, such as
- The Great Wall of China is a human-built megastructure, a few meters wide and 3,947 miles (6,352 km) in length, about 4,975,318 square yards (4,160,000 m2).
- The Rice Terraces of the Philippine Cordilleras, a 10,360-square-kilometer (4,000 sq mi) sprawling agricultural landscape carved in the mountains by free tribesmen of Ifugao some 6,000 to 2,000 years ago.
- Skyscrapers represent our current state-of-the-art in large structure engineering. (See the list of largest buildings in the world.)
- The Large Hadron Collider consist of among other structures a ring 27 kilometers in circumference.
Networks of roads or railways, and collections of buildings (cities and associated suburbs), are usually not considered megastructures, despite frequently qualifying based on size. However, an ecumenopolis might qualify.
Read more about this topic: Megastructure
Famous quotes containing the word existing:
“The mere idea of marriage, as a strong possibility, if not always nowadays a reasonable likelihood, existing to weaken the will by distracting its straight aim in the life of practically every young girl, is the simple secret of their confessed inferiority in men’s pursuits and professions to-day.”
—William Bolitho (1890–1930)
“Who are we? And for what are we going to fight? Are we the titled slaves of George the Third? The military conscripts of Napoleon the Great? Or the frozen peasants of the Russian Czar? No—we are the free born sons of America; the citizens of the only republic now existing in the world; and the only people on earth who possess rights, liberties, and property which they dare call their own.”
—Andrew Jackson (1767–1845)
“A man who has nothing which he cares about more than he does about his personal safety is a miserable creature who has no chance of being free, unless made and kept so by the existing of better men than himself.”
—John Stuart Mill (1806–1873)