An plan to build a mountain above London’s Serpentine Gallery has failed. “The proposal, put forward by the Dutch architect MVRDV, was hailed as the most ambitious project to date in the Serpentine’s annual programme of temporary summer pavilions. It called for a 23m-high steel frame, enclosing the gallery and covered in artificial grass, which visitors could climb to admire the views of London. However, practical and financial problems led to the design being shelved indefinitely.”