This is Flathead Lake in northwestern Montana, USA. The water is so transparent that it seems that this is a quite shallow lake. In fact, it is 370.7 feet deep... uh excuse me?
Machu Picchu, es un antiguo poblado andino en Peru (América del sur), fue declarada como una de las nuevas siete maravillas del mundo moderno
Yuma Az: Territorial Prison. Now a tourist attraction . I have been there several times. On July 1, 1876, the first seven inmates entered the Territorial Prison at Yuma and were locked into the new cells they had built themselves.
Aquaduct in Segovia Spain. No mortar was used in the construction. Visited 1994.