Mt Solitary - the valley’s centrepiece ridge, via the Ruined Castle rock formation

The line through Blue Mountains, NSW, Australia - waypoints, elevation and the day-by-day shape of the walk.
Autumn-spring (avoid summer heat)
Heat, storms; big descent/ascent
Best Mar-Nov; hot and dry in summer. Confirm.
Steep descent into the Jamison Valley, then a big climb to the ridge
Non-technical walking/hiking; confirm any exposed or scrambly sections locally
Marked/waymarked route; navigation generally straightforward - carry a map and confirm locally
Suitable for reasonably fit hikers; not wheelchair accessible - confirm specifics
Moderate
Ruined Castle out-and-back (shorter); overnight on Solitary
Katoomba (Golden Stairs / Scenic Railway)
Out-and-back/loop - no shuttle needed
Day route - none needed
Day-hike kit, water, sun/rain protection, sturdy footwear; coverage varies
Services in Katoomba; limited or none on the trail
Not required; self-guided
No permit; overnight camping options on the ridge
Permits and operators change - confirm before booking.
The big climb out, heat, remoteness in the valley
Retrace the route to exit; dial local emergency services; carry a means of calling for help where remote
This profile is desk research, compiled from public sources - not a first-hand trail report. Coordinates are approximate.