Proud of what we achieve in science and technology advancement. Maybe we think that solar power plants, wind, and the other is a sophisticated technology that was discovered by scientists in modern times. But we certainly do not think that the design of similar technology already invented by ancient civilizations.
1. Windmills DesignWindmills of ancient Persia is one of the oldest windmills ever built by humans. The windmill was built by the Persian empire around 3000 years ago. This windmill used to grind grain and pump water.
2. Persian wind towerStill from the ancient Persian civilization, wind towers or wind tower was used by the Persians to the air ventilation system at home - their home. Their ventilation system is much more complicated than the existing ventilation systems in our homes.

Ventilation systems they have developed since 2000 years ago this might only be rivaled by a ventilation system with modern technology. The principle is to use a combination of air pressure differences, and adjustment of environmental climate in the region of Persia.
3. Roman gravity Waterways
Ancient Romans also developed a water channel that utilizes gravity to drain the water to the entire Roman world. Besides being used to drain the water, gravity drainage is also used in various community activities, such as for water wheels, hydraulic crushers for iron ore, and others.
4. Clandestine Channels
Because Jerusalem is located in the highlands and far from water sources, the city's water needs from underground rivers. Society has developed an underground water channel which can still be used until today, despite having tens of thousands of years old.
5. Pemanfaatan Energi GeothermalAncient Roman civilization have made use of geothermal energy to meet energy needs. Geothermal energy comes from the Vesuvius volcano, which then heats the water in the surrounding area.

Heat generated was then used for various things, such as for hot water bath, hydraulic, medical needs, and others. If electricity has been discovered at that time, perhaps the source of this energy can be utilized more widely.
6. Solar Energy UtilizationUtilization of solar energy has been discovered by the ancient Greek civilization. If we use solar cells as power generation, the civilization of the ancient Greeks used it as a backup heat during winter.
The concept is so simple, they make the building facing toward the sun, and the whole building is designed like that to capture as much sunlight - much in the daytime because the sun is lower than their roof.

When in the evening, the entire Roman civilization a step further by adding glass to absorb the sun's heat to maximum. The utilization of solar energy that has existed since long.
7. Cliff Palace A place called Cliff Palace is located in Mesa Verde National Park, Colorado. This unique building was built by North American society in the past. This unique construction design has a purpose as the cooling of the hot sun at the time.

We can not underestimate just buildings - ancient buildings. Sometimes, with modern technology, though, may not necessarily produce similar buildings with similar functions as well. Ancient architecture was remarkable, indicating that the attainment of knowledge at that time sufficiently progressive.
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