• Visitors can enter some of the chambers and corridors of these pyramids.Pyramids of giza image by AJT from Fotolia.com
  
  Built from rock, glass or metal, pyramids are part of the world's culture both in modern and ancient times. The world's two largest pyramids--in Giza, Egypt--are famous tourist attractions, while the grand pyramids of Teotihuacan are open for people to scale their walls. In Nevada, the massive Luxor Las Vegas is a modern pyramid filled with hotel rooms and a casino. Another modern pyramid, the Louvre Pyramid in front of the Louvre Palace of Paris, is constructed of glass and metal.
  
  

Great Pyramid of Khufu

• See the largest pyramid ever built, the Pyramid of Khufu, in Cairo, Egypt. Standing 481 feet tall, approximately 2.3 million stone blocks that each weigh between 2.5 and 15 tons form the pyramid. The Egyptian pharaoh, Khufu, raised the memorial pyramid around 2550 B.C. According to the National Geographic, the Pyramid of Khufu on the Giza Plateau includes three burial chambers. One chamber is carved from the bedrock beneath the pyramid, while the king's chamber is accessible through the Grand Gallery and is home to a sarcophagus made from red granite nestled at the pyramid's center. Access to the king's chamber was protected from thieves through the use of sliding granite that blocks entryways. Visitors are welcome to enter and explore the pyramid by way of corridors to the interior chambers.
  
  

Pyramid of Khafre

• Home to the Sphinx, the world's second largest pyramid is the Pyramid of Khafre. The son of Egyptian pharaoh Khufu, Pharaoh Khafre built his pyramid at around 2520 B.C. as his burial tomb. The Pyramid of Khafre is 470 feet tall and made from limestone. According to the National Geographic, the pyramid complex is home to elaborate statues including the Sphinx, which was fashioned to resemble Khafre in the embodiment of the Egyptian god, Horus, with a human-headed lion. Explorers unearthed the first ever canopic chest designed for a pyramid at Khafre's pyramid. Shaped as protective spirits, the jars were containment vessels for the stomach, lungs, intestines and liver of the deceased body.
  
  

Pyramid of the Sun

• Visit the third largest pyramid in the world, the Pyramid of the Sun, located near Mexico City in Teotihuacan. Standing 216 feet high, the pyramid has a base almost as wide as the Pyramid of Khufu, the world's largest pyramid. Built in 2 A.D. by an ancient civilization of Mesoamerica, the Pyramid of the Sun sits next to the Pyramid of the Moon. Connected by the Avenue of the Dead, the pyramids played an important role in religious ceremonies that involved ritualized sacrifice. Human sacrifices by priests led the social scene at the pyramid, and as of 2010, tombs of the victims located alongside the avenue are still being unearthed by archaeologists. Walk around the grid complex area and climb to the top of the Pyramid of the Sun to see the magnificent view.