Atarog was a hidden abandoned Inhuman city.
History
Spider-Man and Triton had to go to Atarog in order to rescue Nick Fury who was being held captive by Crossbones and Hydra agents in order to obtain Madame Web. After Crossbones was defeated and Nick Fury took Madame Web to another location, the Inhuman Royal Family arrived. As Spider-Man apologized for trespassing in Atarog while explaining the situation, Medusa interpreted for Black Bolt stating that they were here to give Spider-Man and Triton a ride back to the Triskelion.[1]