Which of the following is the MOST effective version of this sentence?
The discovery of King Tuts tomb in the 1920s was just one of a string of finds which allowed the world to see into the passed of one of the worlds most advanced and ancient civilizations.
The discovery of King Tut's tomb in the 1920s was just one of a string of finds which allowed the world to see into the passed of one of the world's most advanced and ancient civilizations.

The discovery of King Tut's tomb in the 1920s was just one of a string of finds which allowed the world to see into the past of one of the world'

Question

Which of the following is the MOST effective version of this sentence?
The discovery of King Tuts tomb in the 1920s was just one of a string of finds which allowed the world to see into the passed of one of the worlds most advanced and ancient civilizations. 
The discovery of King Tut's tomb in the 1920s was just one of a string of finds which allowed the world to see into the passed of one of the world's most advanced and ancient civilizations.

The discovery of King Tut's tomb in the 1920s was just one of a string of finds which allowed the world to see into the past of one of the world'