Our DD (4 today!) has been at Nursery since she was 6 months old. The outstanding things have included:
Indoor swimming pool (used from Easter to October) where she has passed her first two swimming certs.
Grass paddock with plenty of play equipment and gardening area for planting etc.
Safe gravel area for Winter out door play.
Child size loos (with saloon style swing doors), and sinks plus a hot air dryer - better than towels.
Well stocked library.
Great choice of clean toys and plenty of storage for teachers to get out different types of toys.
Separate office/accident room
Variety of rooms for different ages but with one central dining room type area with little round tables and chairs.
Kitchen with ways of heating lunches etc.
Outsourced learning ie. Spanish (from 3), music teachers, ballet etc.