Egypt:The Pyramids of Giza

Coordinates:29°58′45.03″N 31°08′03.69″ECoordinates: 29°58′45.03″N 31°08′03.69″E
Ancient Name:Khufu's Horizon
Constructed:c. 2560–2540 BC
Type:True Pyramid
Height:146.5 metres (481 ft), ancient
           138.8 metres (455 ft), contemporary
Base:230.4 metres (756 ft)

The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza Necropolis bordering what is now El Giza, Egypt. It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact. Egyptologists believe that the pyramid was built as a tomb for fourth dynasty Egyptian Pharaoh Khufu (Cheops in Greek) over a 10 to 20-year period concluding around 2560 BCE. Initially at 146.5 metres (481 feet), the Great Pyramid was the tallest man-made structure in the world for over 3,800 years. Originally, the Great Pyramid was covered by casing stones that formed a smooth outer surface; what is seen today is the underlying core structure. Some of the casing stones that once covered the structure can still be seen around the base. There have been varying scientific and alternative theories about the Great Pyramid's construction techniques. Most accepted construction hypotheses are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place.


The sides are oriented to the four cardinal points of the compass and the length of each side at the base is 755 feet (230.4 m). They rise at an angle of 51 52' to a height , originally, of 481 feet (147 m) but nowadays 451 feet (138 m). It was constructed using around 2,300,000 limestone blocks, weighing, on average, 2.5 tons each. Although some weigh as much as 16 tons. Until recently, relatively speaking, it was cased in smooth limestone but this was plundered to build Cairo.

Is it conceivable that by bringing together so many people and giving them a common goal, that of making a mountain, a national identity is forged in their hearts. From Upper and Lower Egypt communities would have got to know each other and a common bond would have been manifest in the object of the pyramid. If this is true it is unique because all other forms of nationalism have grown out of war. For example England and France in the Hundred years war and the USA through the revolutionary, civil and Indian wars.

The Great Wall of China

Introduction

Name:The Great Wall
Location:Beijing of China
Length: 8,851.8 km (5,500 miles)
Construction Period: About 2,000 years from the Warring States Period (476 BC - 221 BC) to Ming Dynasty (1368-1644)

The Great Wall, one of the greatest wonders of the world, was listed as a World Heritage by UNESCO in 1987. Just like a gigantic dragon, the Great Wall winds up and down across deserts, grasslands, mountains and plateaus, stretching approximately 8,851.8 kilometers (5,500 miles) from east to west of China. With a history of more than 2000 years, some of the sections are now in ruins or have disappeared. However, it is still one of the most appealing attractions all around the world owing to its architectural grandeur and historical significance.

Before the use of bricks, the Great Wall was mainly built from rammed earth, stones, and wood. During the Ming Dynasty, however, bricks were heavily used in many areas of the wall, as were materials such as tiles, lime, and stone. The size and weight of the bricks made them easier to work with than earth and stone, so construction quickened. Additionally, bricks could bear more weight and endure better than rammed earth. Stone can hold under its own weight better than brick, but is more difficult to use. Consequently, stones cut in rectangular shapes were used for the foundation, inner and outer brims, and gateways of the wall. Battlements line the uppermost portion of the vast majority of the wall, with defensive gaps a little over 30 cm (12 in) tall, and about 23 cm (9.1 in) wide.

Communication between the army units along the length of the Great Wall, including the ability to call reinforcements and warn garrisons of enemy movements, was of high importance. Signal towers were built upon hill tops or other high points along the wall for their visibility.

If you go to China,the Great Wall is worth to visit！