I can't say fully about which cities-though I do know the Sphinx was buried for the longest time. Many Egyptian cities and artifacts of worth have actually been uncovered, either recently or hundreds of years ago by others. However, well I was looking, I found a cool website that had a list of forgotten cities http://www.touropia.com/lost-cities/ Anyhow. I know of others that have been lost in mudslides or disappearing among the waters (the Indian sub-continent).

Ubar was a city in the Arabian peninsula mentioned in the Koran that was swallowed by sand. In the 1990s, a site was discovered using satellite photos that is thought to be Ubar. The book Atlantis of the Sands: The Search for the Lost City of Ubar by Ranulph Fiennes discusses more about the city and the efforts to find it.

this comes to mind.

I don't think much is known about it since only 3 of the pyramids have been [partially] uncovered so far. Due to lack of funding/interest they will be excavating for another 80 years at this rate. You can drive from the Nazca lines to this site in about a half an hour. Also, There was an enormous burial site associated with the pyramid complex and its artifacts made their way to museums all over Peru. There is also some very strange artifacts that came out of here such as skulls with growth plates very different from our own, and cotton that appears to have grown in different colors (not been dyed) To the best of my knowledge, no reputable historian or archeologist has made any sort of "splash" with any of this.

If there was any culture I could know more about it would be this one. I mean sure, the Nazca lines are inexplicable and interesting too. But there are so many other things right there that are equally mysterious.

There's a region in Egypt called the Fayyum, which used to be a lush area thriving with wheat and other crops. This one region could produce so much wheat that most of it wasn't kept there by subsistence farmers, but was shipped out to the rest of Egypt and later the Roman Empire.

However, being backed onto the Sahara desert, massive sandstorms were inevitable, and many large cities in the Fayyum region have been abandoned and later completely covered by sand. Places like Soknopaiou Nesos, Tebtunis, Oxyrhynchus, and Philadelphia (not that Philadelphia) were all buried only to be uncovered centuries later.

Kayehnanator is right about the Sphinx. It was covered in so much sand there is a commemorative plaque from a Pharaoh who reigned maybe a thousand years later saying he uncovered the Sphinx for all to see. It would come to be covered up again and during the 15th-18th centuries only its head was visible. People would come back from Egypt with marvelous sketches and fantastical tales, and in them only the Sphinx's head was visible. Napoleon famously visited and saw the same.

Thank you all, I'll definitely have to check these out when I get back from class!