July's anniversary of the Battle of the Somme is being marked at Powis Castle, near Welshpool, with the basement now turned into a replica trench.
It will aim to  give a flavour of a frontline soldier's life.
Central will be the story of Percy, the fourth Earl of Powis' son, who died in the battle.
An exhibition, which includes battlefield objects, old newsreel and food packaging, runs until September.

The Northern Ireland Fire and Rescue Service was called and up to 21 patients were moved to another area of the hospital.
The Western Health Trust said the patients were removed safely and added it was hoped the hospital would return to normal later on Thursday.
The alarm was raised at 07:00 GMT.
A statement from the Western Trust said: "Smoke was reported coming from a 'bed pan washer' in Ward 5 at Altnagelvin Hospital this morning.
"Twenty-one patients were safely transferred from the ward and have been resettled elsewhere within the hospital.
"It is envisaged that the ward will return to normal business later today.
"The Western Trust would like to thank its staff and the emergency services for their prompt response to the incident."
The turmoil and tragedy of life in the World War One trenches will be replicated at a mid Wales castle as part of centenary events.
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Part of Altnagelvin hospital in Londonderry has been evacuated after smoke was discovered in one of the wards.