Centuries: 3rd century - 4th century - 5th century
Decades: 250s 260s 270s 280s 290s - 300s - 310s 320s 330s 340s 350s
Years: 303 304 305 306 307 - 308 - 309 310 311 312 313
... been declared one of the modern Seven Wonders of the World by the American Society of Civil Engineers[?].
See also: World's tallest structures
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