The Seven Wonders of the World is the first known list of the most remarkable creations of classical antiquity. It was based on guidebooks popular among Hellenic sightseers. In 2000 a Swiss foundation launched a campaign to determine the New Seven Wonders of the World. Given that the original list was compiled in the 2nd century BCE—and that only one entrant is still standing (the Pyramid of Gaza)—it seemed time for an update. And people around the world apparently agreed, as more than 100 million votes were cast on the Internet or by text messaging. The final results, which were announced in 2007, were met with cheers as well as some jeers—a number of prominent contenders, such as Athen’s Acropolis failed to make the cut. The seven that did make the cut are:

THE GREAT WALL OF CHINA: One of the world’s largest building-construction projects, the Great Wall of China is widely thought to be about 5,500 miles (8,850 km) long; a disputed Chinese study, however, claims the length is 13,170 miles (21,200 km). Work began in the 7th century BCE and continued for two millennia. Although called a “wall,” the structure actually features two parallel walls for lengthy stretches. In addition, watchtowers and barracks dot the bulwark. One not-so-great thing about the wall, however, was its effectiveness. Although it was built to prevent invasions and raids, the wall largely failed to provide actual security. Instead, scholars have noted that it served more as “political propaganda.”

Apart from defense, other purposes of the Great Wall have included border control allowing the imposition of duties on goods transported along the Silk Road regulation or encouragement of trade and the control of immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of watchtowers, troop barracks, garrison stations, signaling capabilities through the means of smoke or fire, and the fact that the path of the Great Wall also served as a transportation corridor.

CHICHEN ITZA: It is a Mayan city on the Yucatan Peninsula in Mexico, which flourished in the 9th and 10th centuries CE. Under the Mayan tribe Itzá, a number of important monuments and temples were built. Among the most notable is the stepped pyramid El Castillo (“The Castle”), which rises 79 feet (24 meters) above the Main Plaza. A testament to the Mayans’ astronomical abilities, the structure features a total of 365 steps, the number of days in the solar year. During the spring and autumnal equinoxes, the setting sun casts shadows on the pyramid that give the appearance of a serpent slithering down the north stairway; at the base is a stone snake head. Life there was not all work and science, however. Chichén Itzá is home to the largest Tlachtli (a type of sporting field) in the Americas. On that field the residents played a ritual ball game popular throughout pre-Columbian Mesoamerica.

The Maya name “Chichen Itza” means “At the mouth of the well of the Itza.” This derives from chi’, meaning “mouth” or “edge”, and chʼen or chʼeʼen, meaning “well”. Itzá is the name of an ethnic-lineage group that gained political and economic dominance of the northern peninsula.

PETRA: The ancient city of Petra, Jordan, is located in a remote valley, nestled among sandstone mountains and cliffs. It was purported to be one of the places where Moses struck a rock and water gushed forth. Later the Nabataeans, an Arab tribe, made it their capital, and during this time it flourished, becoming an important trade center, especially for spices, noted carvers. The Nabataeans chiseled dwellings, temples, and tombs into the sandstone, which changed color with the shifting sun. In addition, they constructed a water system that allowed for lush gardens and farming.

At its height, Petra reportedly had a population of 30,000. The city began to decline, however, as trade routes shifted. A major earthquake in 363 CE caused more difficulty, and after another tremor hit in 551, Petra was gradually abandoned. Although rediscovered in 1912, it was largely ignored by archaeologists until the late 20th century, and many questions remain about the city.

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Na 3 you mention?