1. The Great Pyramid of Giza, also known as the Khufu Pyramid, is the oldest and largest of the three pyramids in Giza, Egypt. It was built by Pharaoh Khufu during the Fourth Dynasty of the Old Kingdom of Egypt, around 2560 BC. The pyramid stands at 147 meters (481 feet) high and was the tallest man-made structure in the world for over 3,800 years. It is composed of over 2.3 million blocks of limestone, each weighing an average of 2.5 tons. The Great Pyramid has three known chambers inside and was originally covered in smooth white limestone. Today, only a few pieces of the original limestone remain at the base of the pyramid. There are many mysteries surrounding the construction of the Great Pyramid, including how the massive blocks were transported and lifted into place.

2. The Great Pyramid of Giza is open daily from 8:00 AM to 5:00 PM. The phone number for the Giza Plateau where the pyramids are located is +20 122 234 8834.

3. Tickets to enter the Giza Plateau and visit the Great Pyramid are available on-site. The cost for foreigners is 200 Egyptian Pounds (around $12) and 80 Egyptian Pounds for students with a valid ID. Visitors can reach the Giza Plateau by taxi or public transportation, such as buses and metros. Guided tours and private transportation options are also available for an additional cost.