Okay kiddo, so you know who Alexander the Great was, right? He was a king in ancient Greece who conquered a lot of other places. When he died, his body was placed in a big fancy tomb so people could come and visit and remember him.
Now, here's the thing - nobody knows exactly where that tomb is. Some people think they've found it, but then they change their minds and say it's somewhere else. So basically, it's like a big treasure hunt that people have been trying to solve for hundreds of years.
And even if they did find the tomb, it's been so long that there might not be much left inside. But people are still really interested in the tomb because Alexander the Great was such an important and famous person in history.