In 2002, the Regional Government of Lazio commissioned de Concliis to create the Park of Peace just south of Rome. The project began with the challenge of restoring a 10-hectare (24-acre) park that was essentially in ruins.
De Conciliis’ goal was to transform the park into a living example of peaceful co-existence between world religions and between human beings and nature. To do so, he created three huge stone sculptures dedicated to the three monotheistic religions: Christianity, Judaism and Islam.
De Conciliis placed each sculpture on three different hills facing each other, symbolically suggesting that a peaceful dialogue is taking place between them.
In addition, he designed numerous pathways in the park and lined them with smaller stone boulders, each of which is inscribed with poems and quotations of peace from cultures and religions around the world. His landscape design also included an amphitheatre and many new native trees, shrubs and flowers.
After seven years of work, the park opened in 2009.