This generator by 'watabou' enables you to create a single-page dungeon, with notes, in one click. There's an example I just generated below. You literally just hit "enter" to generate a new dungeon.
Those map assets look hand drawn by Dyson Logos.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.
(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.