His actual intended tomb is probably WV23 which was taken by his successor Ay who ruled for 2-4 years. Tutankhamen's tomb looks like one of the occasional noble tombs that were permitted in the Valley of the Kings - most famously that of Tjuya and Yuya who were the parents of Queen Tiye, Tutankhamen's grandmother and possibly of Ay.
Under Ay's rule, Tutankhamen and his relatives were beginning to be whitewashed from history and it does look like Tutankhamen's burial was a house clearing of all of the Armana period. Ay also used the death of Tutankhamen to legalise his claim to the throne by having himself depicted as pharaoh on the tomb paintings performing the 'Opening of the Mouth' ceremony that conferred eternal life on Tutankhamen. He was in short, a total bastard.
Some of the items in the tomb are labelled for Akhenaten and the very shadowy pharaoh Smenkare Djeser Khepheru who was either Tutankhamun's predecessor or his predecessor but one, whilst other items have been relabelled for Tutankhamen - most distinctly, his second coffin which has a different face to the others.
The complete obliteration of Tutankhamen's record came under the following pharaoh Horemheb, also not from the legal succession, who simply extended the rule of Amenhotep III to cover the reigns of Akhenaten, Smenkhare, Neferneferuaten (which might be the throne name of Nefertiti), Tutankhamen and (some measure of justice) Ay. Horemheb had the worship of the Aten banned, demolished its temples and spent his reign carving his name over the rather beautiful sculptures that went up during Tutankhamen's reign.
And yes, go to the Cairo Museum and be amazed. The new museum is almost ready and there will finally be space to see some of the exquisite works. The material from the Old Kingdom - especially the sculpture is simply mind blowing. But if you can't get that far, visit the Egyptian collection in Berlin to see the incredible work being done during the brief Armana Period prior to Tutankhamen's reign - the bust of Nefertiti is worth the air fare alone.