An area of Ministry of Defence land in the Pembrokeshire Coast National Park is being opened to the public for one day.
The Manorbier Range is normally off-limits as it is used as a testing range for missiles, but the ministry will partner the national park authority for a guided walk on the morning of August 8th.
It means those who cannot usually go walking
in the area will be able to enjoy the coastal scenery as well as learning more about the military history of the range, which dates back to 1938.
People wanting to take part have been advised to book early to avoid disappointment, with the event starting at 10:00 BST.
Walkers have been able to enjoy more of the Welsh coastline than that of almost any other nation in the world since May, when the first national coastal path in the world was established, stretching for 870 miles.