Near Lake Titicaca in Western Bolivia, the Pre-Columbian adobe city of Tiwanaku built circa 500 AD still stands, though today the ancient city looks much more like an art installation than the bustling empire it once was.
In our world of today we see some great infrastructures around us. If we look around us we do find strange place too, made by humans only with least help of machines those are available today. There are places you find strange even to visit as it is very difficult to reach there but people are living there for ages now. Have a look!