Great Pyramids of Giza, Egypt [Photo/China Daily]

Built between 2631-2498 BC, the Great Pyramids of Giza is a group of pyramids in the Giza Necropolis bordering on what is now El Giza, Egypt. The group is the oldest of the Seven Wonders of the Ancient World and the only one to remain largely intact.

The site is composed of three major pyramids, including Khufu, Khafra and Menkaura, the Great Sphinx and several smaller pyramids. It is said that it took 100,000 labors and 30 years to complete their construction. How they designed and built such enormous and elegant objects in undeveloped ancient times remains much of a mystery to this day.