The man who discovered king Tut's tomb was Howard Carter. It took his almost ten years to take all the 3,500 objects out of King Tut's tomb. I don't think that I would have had the Patience to be underground for ten years taking jewels and riches out of some dead guy's tomb. I went to a king Tut exhibit in Denver one time and I was really mad because they didn't bring the mask from his sarcophagus like they used too. The Egyptian government deemed it too fragile to travel. I just think they want people to come to Egypt to see it.
There are 62 know tombs dug in to the Valley of the kings. Well, only 62 for the pharaohs but there are hundreds and hundreds more dug for noblemen, craftsmen and the king's advisers. Most of these tombs have been robbed or destroyed by tomb robbers. Most of the tombs can't be identified because they are in such bad shape. I hope when i die no one put any riches in my coffin because I don't want to have grave robbers take my stuff.
No, not all of the tombs in the Valley of the kings were underground, most were, but not all the tombs. In fact there are 15 temples that were built in the honor of specific pharaohs. One of the most note able temples is the temple at Karnak. It is a huge temple carved into the mountain side and is called that because it was made at well, Karnak.