The museum, which is reasonably-priced and well worth every cent of the admission fee, now has exhibits outlining more of the investigation that led to the arrests, trials, and convictions of Timothy McVeigh, Terry Nichols, et al. One now has the opportunity to see real pieces of the moving truck that contained the 4,000-pound bomb, including one of the axles. I was taken aback to see McVeigh's gun - a glock - that he had on his person at the time of his arrest (initially a routine traffic stop in northern Oklahoma. I was intrigued to see the power drill, owned by Terry Nichols, and proven to have been used (by the patterns on the hole made by a specific drill bit) to break into a padlock. Further additions to the museum will include a hotel sign from a facility used by McVeigh while executing his mission, and his actual getaway vehicle.
As I understand it, there was a delay in the revealing of the newest areas of the museum - ironically due to structural damage to the building thought to be a result of the 1995 bombing across the street. The new opening date is sometime in September. Before you visit, read my book Crumbling Spirit. It might give you more perspective on the thoughts and feelings of the people who lived through the tragedy.