Stargate SG-1 - Season 10 Episode 16

When SG-1, minus Carter, investigates a previously unexplored planet expecting to find themselves in a pyramid, they are astounded to find themselves in a museum. Finding a party occurring in the lobby, they decide to leave and make first contact later, but they find that the DHD is a replica and thus incapable of getting them home. They are discovered and believed to be rebels and are forced to take hostages to buy time for their escape.