The long walls of Athens protected Athens and its physical harbour of Piraeus. The distance was 24 kms. Remnants of the wall may be noticed in specific areas even today.
That is a very hard question because originally there was The Ming Wall. It eroded and was rebuilt and extended many times over. The last construction on The Ming Wall recorded that it was over 6,000...
The Great Wall stretches from Shanhaiguan in the east, to Lop Nur in the west, along an arc that roughly delineates the southern edge of Inner Mongolia. The most comprehensive archaeological survey,...