Geologists Were Surveying a Modern City—and Uncovered a Hidden Ancient Metropolis
A geology professor believed that aerial photos from the 1950s show evidence of an ancient city under Nakhon Ratchasima in ...
UNESCO4d
The Great Wall
In c. 220 B.C., under Qin Shi Huang, sections of earlier fortifications were joined together to form a united defence system against invasions from the north. Construction continued up to the Ming ...