The competition-winning 'Gateway' schemes, which were selected from a 15-strong shortlist including SMC Alsop ( Landmark Wales competition shortlist revealed ), will now be submitted for £13 million worth of Big Lottery funding.
Tonkin Liu's victorious proposal, dubbed 'A Postcard to Wales', is earmarked for a site in Flintshire on the A550; Marks Barfield's 'Red Cloud' will sit at the entrance to the Second Severn Crossing; and Ian Ritchie's 'Y Tri Maenhir', designed with engineers Techniker, will grace Holyhead Harbour.
Peter Cole, chair of the Landmark Wales steering group, said: 'The final selection process took into account a number of criteria including artistic merit and the drama of the proposal, relevance to the stated aims of Landmark Wales, deliverability of the proposals and public reaction.
'We are confident that our choices are the right ones and now hope to secure the Big Lottery Fund backing we need to bring the Landmark Wales project to life.'
The winners of the second Landmark Wales competition for a further three sites are expected to be announced shortly.