If you want to take a tour in Barto Hell, experience it personally rather than through books (don't ask me why some people have this idea), then the 'City of Dis,' the City of Steel, will definitely be your first choice.
Among the Nine Prisons, the second layer has the mildest environment. It's not like the first layer, which is caught in endless war, nor is it like the third layer, a swamp where acid rain, mud, and bone-chilling hail hold sway.
It used to be somewhat similar to the fourth layer: the air distorted by high temperatures, rivers and lakes filled with bubbling magma, the ground scattered with thousands of fissures spewing flames, and the entire plane realm dominated by malicious, scorching fires.
