While one of the gatehouses is shut tight, you can see some of the inside of the ruined gatehouse.  Right inside the badly damaged doorframe is a large pile of rubble and debris centered around a large boulder that appears to have come crashing through the ceiling.  There is blood crusted on some of the rubble and at least one body lying on the ground in a puddle of dried blood.  Other than that, the inner bailey seems deserted.

So, while Marcon is currently checking the Western gatehouse and the rest of the party seems to be standing cautiously at the main gate. To your left, the Eastern gatehouse still remains closed and short distance away- about 30 feet from the gate, the doors to the keep are also closed.