Demon Slayer- Kimetsu No Yaiba - Infinity Castle -

The Infinity Castle is introduced as a seemingly impenetrable fortress, capable of shifting and changing its layout at will. It is said to be the domain of Muzan Kibutsuji, the primary antagonist of the series, and serves as a nexus for his dark powers. The castle's eerie and unsettling atmosphere is amplified by its ability to manipulate and trap its visitors, making it a formidable obstacle for the protagonists.