Close Out! Historic Castle Rock offers the best of all worlds, combining small-town charm with big-city style and endless activities for outdoor enthusiasts. Opal Ridge at Crystal Valley Ranch may well be the crowning jewel of this popular destination. The community offers open space, wildlife corridors and views of the Rocky Mountains from Pike's Peak to Mount Evans. Many planned on-site amenities include a full-service recreation center, an outdoor amphitheater, basketball and tennis courts, swimming pools, and multi-use fields for soccer, baseball, softball, and social events.