I was in Oklahoma City for only 3 hours and this was the one thing I chose to do and I'm so glad I did. The most moving part of this thoughtfully created museum experience were the chairs representing each victim, placed where they were found in the footprint of what was the federal building. I visited in September 2020, on a Friday afternoon during Covid. The staff and safety guidelines were well explained. The museum was not overcrowded and I felt safe. The memorial outside on the lawn is free and can be visited during off hours, however the meaning and relevance of it is truly best experienced after you do the eye witness tour. The museum suggests you will spend 2 to 3 hours inside the museum, but i had a short window in Oklahoma City and was able to do the inside in one hour and then spent 30 minutes in the outside area taking in the full depth of what had happened and how it affected the families and community. Inside the museum, be sure to take time to do the pre-9am meetng film on level 3 which leads you into a conference room recreation where you hear the recording of a court hearing that occrured at the time of the bombing. it's chilling.