Short answers, pulled from the story.
The Ravenscar resort development failed because the beach was rocky and far below the clifftop village, making the descent too difficult for holidaymakers. The Peak Estate Company went bankrupt, and the estate was sold by auction in 1911, leaving behind roads and sewers but almost no houses.
The last alum works at Ravenscar closed in 1871 following the invention of a synthetic dye fixer, which made natural alum obsolete as a mordant for the dyeing industry. The old Peak alum works north of the village are now a National Trust site.
Raven Hall is a historic house in Ravenscar built in 1774 for Captain William Childs of London, a captain in the King's Regiment of Light Dragoons and owner of the local Alum Works. It was extended as a hotel from 1895 and is now associated with Classic Hotels.
In the Hellblazer comic book series, the anti-hero John Constantine was committed to the fictional Ravenscar Lunatic Asylum after a disastrous summoning and returned there repeatedly across the series. Ravenscar Lunatic Asylum is fictional and distinct from the real North Yorkshire village.
The 110-mile Cleveland Way National Trail passes through Ravenscar, as does the Cinder Track, part of National Cycle Route 1. Ravenscar is also the eastern terminus of the Lyke Wake Walk, a challenging cross-moor route that ends where it meets the coast road.
Ravenscar featured in the double episode The Swords of Wayland from the 1980s show Robin of Sherwood. The exterior of Ravenscar Castle was filmed at Saint Michael's Mount in Cornwall, and the interior, including the room where the seven swords were kept, was filmed at Wells Cathedral in Somerset.