Researchers using state-of-the-art scanning technology have produced a highly detailed 3D digital map of Londonderry's historic walled city. The Walls of Derry are famous for being the only completely ...
The 8.5-mile-long wall that surrounds Xi’an, touted as one of the best-preserved walled fortifications in China, could be the next UNESCO World Heritage site. Millions of people converge on Xi'an ...