World Adventures Tombs Not Reset for Next Sim

I got the Sims 3 World Adventures expansion pack for Christmas! It is fun so far! I picked a single-Sim family in Riverview and took her to Egypt. I completed some adventure quests, and worked through the biggest pyramid tomb and the Sphinx. Then I decided to create a sim perfect for adventuring: including the Adventurous, Brave, Loves the Outdoors, and Friendly traits. I sent her to Egypt and realized the tombs that the first sim completed are still completed! So we’ll only have to go through them once per neighborhood, and all the other Sims will be able to go right through? There are still relics, gems, and ancient coins to collect, but all of the hidden doors are opened and traps disabled (whatever the first sim completed). I thought it would be reset for each Sim or family who visits. I guess it’s kind of nice, since it may get old doing the same steps for each sim. If one sim releases a mummy, will it still be walking around for the next sim?