Ravenhill

Ravenhill was a Dwarvish watchtower placed on a spur of the Lonely Mountain before the Gates of Erebor, overlooking Dale, The Long Lake and the Long Valley. It was home to the Ravens of Erebor.

It was abandoned and partially ruined when Smaug desolated Dale and the Long Valley. Upon reclaiming Erebor, the Dwarves used it to see Smaug's conflagration of Lake-town, and his subsequent demise.

The Hobbit: The Battle of the Five Armies
Azog occupied Ravenhill as a command post during the Battle of Five Armies, using flags and horns to command his army. When Thorin joined the battle, he led Fili, Kili , Dwalin and Balin in an assault up Ravenhill, through the frozen channel of the River Running. However, Balin was left behind, and the other Dwarves climbed up the hill on goats, unwittingly walking into a trap set by Azog, who had a second army from Gundabad approaching from the North, behind Ravenhill.

Feigning a retreat, Azog lured Fili and Kili into inspecting the tower, where Fili was captured and killed, drawing Thorin and Kili into the complex. Bilbo Baggins arrived to Ravenhill, telling Thorin and Dwalin. The skirmish saw Bolg coming ahead of his army to aid his father. He killed Kili but was killed by Legolas, who gave Thorin his sword back. With it, Thorin killed Azog, ending the Battle, but was mortally wounded by the Orc.

Bilbo, who had regain consciousness saw Thorin and attempted to tend to Thorin's wounds, but the hobbit sees that his friend is beyond help. Thorin continues, in his last dying breaths of the things he said, the deeds he'd done back at the gate, and leading him into many dangers. Bilbo says he was glad to of shared perils with Thorin. In his last dying breath, Thorin says. Farewell, Master Burglar. Go back to your books, to your armchair. Plant your trees, watch them grow. If more people valued home above gold, this world would be a merrier place. And then, Thorin dies.

A helpless Bilbo breaks down crying and mourns his fallen friend. Gandalf later comes up to Bilbo in a pour attempt to cheer him up, but he is still upset Thorin is dead.