stone ball weight sling length counterweight design distance from the castle whether to add wheels Build it right, and you will crush the wall. Build it wrong, though, and you may have to face ...

A 400-year-old stone wall once part of Edo Castle, discovered only last year at what is now the Imperial Palace in Tokyo, is likely the castle’s oldest existing remnant ever unearthed ...

The stone wall, which is 1.8 meters tall and 7 meters wide and runs east to west, is believed to have been a boundary that divided the central part of the castle and warriors’ residences.