The planet of the evil, tyrannical Darkseid and the New Gods.
Apokolips, from a distance, appears to have an artificially smooth surface except for large crater-like openings filled with lava that emit long plumes of flame like a blast furnace. The surface has linear patterns on it like those of a printed circuit board and some of the lines appear to be canals with lava in them running to or from the craters.
At ground level there is an atmosphere of perpetual night-time, but we can still see that there are many skyscraper-like buildings set against a red sky. One of the buildings is said to be Darkseid's citadel and is seen to contain the war room of Steppenwolf.
Another building that is a residence of Darkseid is set in a lake of lava and contains his throne which is set high up on a structure like a Mayan pyramid.
Travelling to and from Apokolips is usually done via a travel portal called a boomtube which is a local technology. However, characters like Superman and Space Cabby are still able to travel there quite normally.