The Great Pyramid — the oldest and largest of the pyramids of Giza — is the only one of the seven wonders of the ancient world that's still in existence today. The massive structure was built for the Pharaoh Khufu in the 26th century BC and is surrounded by another five pyramids as well as the Sphinx. Some travelers bemoan the fact that the pyramids are a breeding ground for locals trying to get money in one way or another, but that doesn't take away from the attraction's beauty and history.

If the mind-boggling age of the these pyramids doesn't wow you enough, their scale surely will. The Great Pyramid is made up of 2.3 million stone blocks and held the title of tallest building in the world for 4,000 years.