This here is "The Voice of Evil," a massive LEGO diorama built by sculptor Duco Brugman. After he planned this imposing castle for over three years, this 20-kilogram monolith took approximately eight months, countless LEGO bricks, and fifteen meters of light wire embedded under the lava to complete. Keep your eyes peeled for the burning skeleton army stomping through the flames.
You can watch a video of "The Voice of Evil in action here. For an equally intricate landscape more on the science fiction side of things, see Nannan Zhang and Tyler Clites' "Containment." And for a stronghold more familiar, see LEGO Mordor.