I would want a massive evil palace with a large hall containing a long evil table where I sit and discuss being evil with my co-conspirators. At said evil table, we would discuss our tactics for spreading evil, with topics including but not limited to; evil ideas, evil actions, the recruitment of henchmen, the suppression of good, evil deity worship, evil propaganda, cool evil clothing designs (massive black and red cloaks for being very evil), mischief, misinformation, lying, tying damsels to train tracks, doing evil science experiments on animals (such as making alligator-bee hybrids), writing evil books, best maniacal laugh practices, ways to foil the journey of the protagonist, making stuff generally miserable, causing economic inflation, defunding hospitals, switching to a Kohls-cash based economy, cool laser weapons, coal mining (1800s style).
We would have cool evil servants that serve us evil tea and beer to keep us satiated for long evil-discussions about doing evil and being evil and shit.