Beautiful, eerie wind sculpted limestone. This is a pleasant picnic spot for families as well as great wandering area. It's easy to lose yourself in the mystical qualities of this stone city. There is plenty of climbing to be had here in all grades, so it may be hard to feel crowded here. The Limestone has great cracks and pockets as well as pure friction for some strange climbing.
From Christchurch take highway 73 west towards Springfield and Arthur's Pass.
When coming from this direction, the access path to Spittle hill, Quantum field, et all is at a gate just before the Castle Hill Ranch. Park along the road and then take the 10 minute hike back to Spittle Hill, Quantum Field, Dark Castle and Wuthering Heights.
Flock Hill, Dry Valley and Prebble Hill are further down highway 73.
Definitely a hard place to get to if you're not in NZ, Castle Hill is a phenomenal climbing location. It's too bad MP doesn't have more than (at the moment) 10 climbs listed in Castle Hill.
This place is astounding. Bountiful amount of climbs for all. Highly recommended, and as others have stated, the Dalai Lama once said that he felt Castle Hill to be "the center of the spiritual universe."
Talk about getting pumped and getting good vibes for climbing.