The Grand Canyon Skywalk is a transparent horseshoe-shaped cantilever bridge and tourist attraction in Arizona near the Colorado River on the edge of a side canyon in the Grand Canyon West area of the main canyon.[USGS topographic maps show the elevation at the Skywalk's location as 4,770 ft (1,450 m) and the elevation of the Colorado River in the base of the canyon as 1,160 ft (350 m), and they...
Stonehenge is a prehistoric monument located in the English county of Wiltshire, about 3.2 kilometres (2.0 mi) west of Amesbury and 13 kilometres (8.1 mi) north of Salisbury. Probably the most famous sites on the planet, Stonehenge consists of earthworks surrounding a circular setting of large standing stones. It's on the centre of the most dense advanced of Neolithic and Bronze Age monuments in England, including several hundred burial mounds. Archaeologists have believed that the long-lasting stone monument was erec...
Optical illusions have been first used by the Greeks. They constructed their temples so that the roof was slanted. This gave the illusion that the temple was truly standing straight. Additiona...
Posted : November 10, 2011 | 
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