The Smithsonian Annex was a large museum complex located on planet Nova Atar III by the late 2260s.

The administration at the museum banned equipment being brought into the museum by visitors, and had the Annex equipped with a forcefield which prevented unauthorized beaming and prevent the theft of artifacts.

Amongst the artifacts on display in the Annex in 2269, were the latest de-classified information which had been salvaged from the wreckage of a Klingon vessel.

In 2269, the complex was taken over by Ocanan terrorists for a short period of time. Thankfully, the situation was defused by the senior officers of the USS Enterprise. (TOS video game: Judgment Rites)