NCIS is up there with some of the longest running TV shows in history, having been on our screens for 14 years and counting.

Image SourceWe’ve been hooked by the team of NCIS special agents and their investigations for 14 seasons, but even the biggest hardcore fans have been missing out on some surprising facts about the show for all these years.

Well, prepare to be amazed by this rare look behind the scenes of one of American’s most famous TV shows.