QUESTION:
Why doesn't NASA have a simulated site complete with a duplicate Pathfinder
and Sojourner?

ANSWER from Charles Whetsel on July 28, 1997:
We do have a simulated site complete with duplicates of both the Pathfinder
Lander and the Sojourner Rover (as well as simulated Martian rocks and
soil).  It is located next door to the Mission Control room which was
televised so frequently over the preceeding few weeks.  It was used
extensively during the test and training exercises prior to landing and has
been used to validate many of the sequences sent to Pathfinder since
landing.  So far, no one has recreated all of the rock formations around the
lander to represent the actual landing site, but this could be done in short
notice should the need arise.