Cadw, the Welsh Assembly Government's historic environment agency, has confirmed that it is to undertake an upgrade of Denbigh Castle, which will feature a new visitor centre.
A total of £600,000 will be invested in the overhaul of the North Wales attraction as part of Cadw's £19m Heritage Tourism Project, which has received European Union support.
In addition to the new purpose-built visitor centre, town wall walks are to be opened up and the presentation and interpretation of the property improved.
Welsh minister for housing, regeneration and heritage Huw Lewis said: "The new facilities will include all that a visitor needs to understand, appreciate and enjoy the outstanding heritage that Denbigh has to offer.
"Better access coupled with fun activity is the key to making heritage sites relevant and enjoyable - both for visitors and people who live locally."