It was built in 6 steps of rough limestone and mortar, with a casing of fine white limestone. Sahure’s pyramid would have originally measured around forty eight meter high with sides of seventy eight and half meter and is a quite classic example of a Dynasty V pyramid. Similar to other pyramids of this period the subterranean chambers and tunnels were constructed at that time as the upper steps of the pyramid requiring a construction gap, which was later filled in with rubble.
Lepsius explored the tombstone in the mid 1800s, followed soon by Perring. He was the first to enter the underground chambers, but it wasn’t until the early twentieth century that Sahure’s pyramid was accurately unearthed and recognized by Ludwig. Now, since 1995, the whole region has been re-examined by the Egyptian Supreme Council who are currently working on partial modernization of the mortuary complex. Sahure’s mortuary sanctuary was built on the east face of the pyramid. It was constructed mostly from stonework and basalt, which has resulted in its first-class position of conservation, the outer part of the temple consisted of an entrance hall leading into an open porticoes court, its side walls decorated with colorful reliefs of Sahure’s victories over Asian and Libyan enemies.

The Great Pyramid of Giza in Egypt is considered one of the Seven Wonders of the World. Even today it is one of the most powerful of our world. The time of building is predictable at 2570 BC and today is still a mystery for its building techniques, and their numbers are appalling. The real elevation of the pyramid was 146.61 m, but now due to the wear calculated a total of 136.86 meters. The pyramid was the largest building in the world until the nineteenth century, passed by the cathedral of Cologne.

Concerning the stone slabs has a weight about 2 to 60 tons. It is affixed that these stones were moved over thousand kilometers from the quarries of Aswan, or vehicles without wheels to understand how this civilization could build such a majestic monument. Many of our modern beliefs stem from a mystic "science" of the past. A clear look at the structure using simple techniques helps to flesh out mystery and myth of archaeology, Egyptology, history, and a host of pseudo-sciences regarding the Pyramids, Ancient Egypt, Pharaohs, the Sphinx, and more. The author, Ted Widen, takes the reader step by step by the first reasonable text on the pyramid construction. No spiral ramps or weird stuff, just straight forward truths.

In the north of China, there is about 6,700-kilometer-long ancient wall, now recognized as the Great Wall of China, it begain at the Jiayuguan Pass of Gansu Province in the west and ends at the Shanhaiguan Pass of Hebei Province in the east. This is an immensely long man made wall that was constructed to keep out invaders, although this was originally built for defense, the wall stands as a honor to the amazing originality of the Chinese. Great wall one of the eight wonders, then China’s the Great Wall has become the symbol of their nation and its culture. UNESCO in 1987, listed the great wall as a World Heritage Site, it’s is a true marvel and a testament to the long history of the Chinese Civilization. Now, most part of the Great Wall of China have almost disappeared due to overwhelmed by the elements, buried by the desert and eroded by local people recycling the wall’s materials for constructions in their villages. However, the Great Wall of China in large portion still stands in silent splendor, lasting the passage of time and greeting the changes of the seasons as it has done for many hundreds of years. Plenty of stunning mythology and stories about the Great Wall of China take place subsequent along the construction, and since that time these stories have swell around the country.

The island of Rhodes was an important economic center in the ancient world. It is located off the southwestern tip of Asia Minor where the Aegean Sea meets the Mediterranean. The capitol city, also named Rhodes, was built in 408 B.C. and was designed to take advantage of the island's best natural harbor on the northern coast. The Colossus of Rhodes is familiar to almost everyone. Its history begins with the siege of Demetrios Poliorketes, successor of Alexander the Great, in 305 BC.
When Demetrious was defeated, he abandoned all his siege machinery on Rhodes. The Rhodians decided to express their pride by building a triumphal statue of their favorite god, Helios. From its building to its destruction lies a time span of merely 56 years. Yet the Colossus earned a place in the famous list of Wonders, it was a symbol of unity of the people who inhabited that beautiful Mediterranean island of Rhodes. The base was made of white marble, and the feet and ankle of the statue were first fixed. The structure was gradually erected as the bronze form was fortified with an iron and stone framework. To reach the higher parts, an earth ramp was built around the statue and was later removed. When Demetrius attacked the city, the defenders stopped the war machine by flooding a ditch outside the walls and miring the heavy monster in the mud. By then almost a year had gone by and a fleet of ships from Egypt arrived to assist the city. Demetrius withdrew quickly leaving the great siege tower where it was.

The Colosseum of Rome was built in bricks and clad of travertine in a valley among the Palatino, Esquilino and Celio hills after having dried a small lake that Nerone was using for the Domus Aurea. The edifice of four floors, with a total height of 52 meters and an extension covering and elliptical area of about 19000 square meters, is with no doubt the most renowned symbol of Rome all over the world. For the enjoyment of Rome people, here were organized fights between gladiators or against wild animals and fabulous spectacles as "naumachie", real navy battlements in the arena filled with water. Under the arena of the Colosseum there were numerous corridors and rooms aimed at welcoming the gladiators and the ferocious beasts that could be brought at the centre of the arena thanks to elevator carriages and access ramps.The building of the Ancient Roman Colosseum was widely regarded as a political move of the time, intended for entertaining and, possibly more importantly, distracting Rome's population from more serious issues of the time such as oligarchy, nepotism and corruption in the senate and church

The truth is that no one knows for sure though there are some pretty good guesses. The chances are that a number of processes combined to create the views that you see in today’s Grand Canyon. Water seems to have had the most impact basically because our planet has lots of it and it is always on the move. Many people cannot understand how water can have such a profound impact considering that the Canyon is basically located in a desert. This is one of the biggest reasons that water has such a big impact here. Because the soil in the Grand Canyon is baked by the sun it tends to become very hard and cannot absorb water when the rains to come. When it does rain the water tends to come down in torrents which only add to the problem.
The plants that grow in the Grand Canyon tend to have very shallow root systems so that they can grab as much water as possible on those rare occasions when it does rain. Unfortunately these root systems do nothing to deter erosion by holding the soil in place. After erosion by liquid water the next most powerful force is probably its solid form, ice. In the colder months, especially on the north rim, water seeps into cracks between the rocks. These cracks can be caused by seismic activity, or by the constant soaking and drying of the rocks. When the water freezes it expands and pushes the rocks apart and widens the cracks. Eventually rocks near the rim are pushed off the edge and fall into the side canyons. These rocks sometimes hit other rocks and are stopped but on occasion one fall by a large rock will cause a cascading effect and create a rock fall that will alter the landscape drastically in the side canyon.

The reef contains an abundance of marine life and comprises of over 3000 individual reef systems and coral cays and literally hundreds of picturesque tropical islands with some of the world’s most beautiful sun-soaked, golden. The Great Barrier Reef is one of the seven wonders of the natural world, and pulling away from it, and viewing it from a greater distance, you can understand why. It is larger than the Great Wall of China. Corals make up the various reefs and cays. These are the basis for the great variety of sea and animal life in the Reef. Coral consists of individual coral polyps - tiny live creatures which join together to form colonies.
The greatest dangers to the habitat are the Crown of Thorns starfish. Since the 1960s the Crown of Thorns has been destroying the corals which make up the reef. Crown of Thorns outbreaks go through a series of stages which can take from 1 to 15 years. Different degrees of protection are provided for different habitats in the World Heritage Area. One of the main aims of the Reef Plan is to maintain biodiversity within the larger ecosystem of the Reef as well as different habitats to help sustain the biodiversity of species and population levels.