What doe scouting party see at the front gate in the hobbit?

In "The Hobbit," the scouting party, which includes Bilbo and the dwarves, sees a heavily guarded front gate of the Lonely Mountain, where they notice the door is hidden and can only be revealed by a specific keyhole at the right time. They observe the mountain's imposing structure and the surrounding terrain, realizing that they must find a way to unlock the secret entrance to access the treasure inside. This moment underscores the daunting challenge they face in their quest to reclaim the dwarves' homeland from Smaug the dragon.