AART Wins Competition for Underground Royal Treasury at Rosenborg Castle in Copenhagen Danish architecture practice AART has won the international competition for Rigets Skatkammer (The Royal Treasury), a new 1,300-square-meter underground extension to the museum at Rosenborg Castle in Copenhagen . Developed in collaboration with VEGA Landskab , Fogh & Følner, and Artelia , the proposal places approximat… — ArchDaily