Caernarfon Castle's main gateway has been undergoing work for the last three years which will now provide access to areas previously unseen for hundreds of years.

The castle's grounds in Gwynedd were where the now King was invested as Prince of Wales in 1969 - a move which proved controversial and sparked significant protests.

The £5 million investment includes new flooring in some parts and a lift to allow access for all to upper levels.

The aim of the project is to ensure the castle is "welcoming and accessible".

The castle is part of a World Heritage Site alongside Harlech, Conwy and Beaumaris castles.

Cadw, the Welsh government service that looks after historic buildings and structures, is encouraging visitors to witness the views from the rooftop deck's upper embattlements.

Gwilym Hughes, head of Cadw, has thanked the public for their "patience" during the work.

"We look forward to welcoming visitors of all abilities to experience this area of the fortress for the first time in centuries, and hope that our new interpretation will provide new ways for visitors to understand the Castle's story," he said.

"This new interpretation will demonstrate the skill and knowledge that went into building the castle that is now a World Heritage Site. It also provides a context that will allow a fuller understanding of a time of intense conflict between the indigenous Welsh princes and the English monarchy."

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Dawn Bowden MS, the Welsh government's deputy minister for arts and sport, added: "Enhancement projects like this one ensure that everybody can access Welsh history and learn more about the nation's heritage.

"Cadw's new interpretation will further support this, inviting visitors to discover the lesser-known stories of the Castle's history."