The youngest of the three buildings is Newbridge memorial hall

Newbridge Institute, Llanfyllin Union workhouse and Cardigan Castle have all opened over the weekend to show off their potential to visitors.

Winners from seven regions and one runner-up with the next best result will compete for £2.5m.

The lottery funding will pay for restoration work to the building.

In all, 21 buildings across the UK have been chosen for the series, which is presented again by Griff Rhys Jones.

On Saturday, the Grade 2-listed Llanfyllin Union workhouse in Powys, which dates from 1838, gave guided tours to visitors.

Norman

Cardigan Castle in the centre of Cardigan has been open on both Saturday and Sunday.

There has been a building on the site since at least Norman times.

Both sites need an estimated £3.5m to be restored.

Meanwhile Newbridge Institute and Memorial Hall in south Wales has been giving tours of its old cinema and stalls, and had performances by choirs and brass bands throughout the building on Sunday.

The newest of the three, it needs about £2.49m.