Incan wall in Cuzco

I took this pic a long, long time ago when we were in Cuzco, Peru. The Incas were masters of engineering. One thing I will never forget from my two years in Peru was the many examples of their skills, like this wall. The accuracy and craftsmanship is unparalleled.

Some walls contained stones that would be difficult to lift with today's technologies, yet alone carve so amazingly.