From Cambridge University’s Christ’s College– Darkness Visible will help students new to John Milton’s Paradise Lost, with summaries of each book, descriptions of major characters, a gallery of illustrations with interactive features, and much more– tons of stuff.
A dungeon horrible, on all sides round
As one great furnace flamed, yet from those flames
No light, but rather darkness visible
Served only to discover sights of woe . . . (I.59)