THE £3.5m revamp at Fort Nelson has been given the seal of approval by the Heritage Lottery Fund as a plaque was unveiled.
The completed redevelopment marked 140 years after the first volunteer troops marched into the fort, near Fareham.
The Heritage Lottery Fund (HLF) provided a £2m grant towards the revamp.
Stuart McLeod, head of the HLF in the south east, said: ‘Our investment has helped transform the Royal Armouries Museum at Fort Nelson, conserving its history and making it accessible and enjoyable for everyone.’
The free museum now includes a new gallery, a new visitor centre, and state-of-the-art education facilities.