Not quite the same level of antiquity as Inca ruins, but I have family in Peleliu which was the site of a major WWII skirmish between Allied forces and the Japa

Not quite the same level of antiquity as Inca ruins, but I have family in Peleliu which was the site of a major WWII skirmish between Allied forces and the Japanese (specifically). There are so many ruins everywhere that people don't think much of them at times. I once came across part of a plane wing just haphazardly buried on a beach and we just sort of marvelled at it for a moment and moved on. There are obviously designated areas and monuments (to both sides) and there is a museum but throughout the island it is scattered with remains everywhere that it isn't uncommon even know to run into things.