Great Pyramid
From Memory Alpha, the free Star Trek reference.
The Great Pyramid of Giza was the largest of the ten pyramids built in Egypt. Its construction had been observed by anthropologists since 2769. They followed all of the proper time travel protocols. It was the only one of the Seven Wonders of the World to survive into the modern age. (ENT: "Cold Front"; DS9: "Badda-Bing, Badda-Bang")
The Great Pyramid was also among the images displayed by the Guardian of Forever. (TOS: "The City on the Edge of Forever")
