[1] The hill was located in the north-east corner of Hyde Park, close to Marble Arch, at the western end of London's Oxford Street.

The 25-metre (82 ft) high hill[2] was built from scaffolding covered with sedum turf and a number of trees,[3][4] with 130 steps up[5] (or a lift)[6] to a viewing platform at the top and an events space inside.

[9][10] The project was commissioned by Westminster City Council, hoping to boost domestic tourism;[10] to help speed up the return of shoppers to Oxford Street after the COVID-19 pandemic lockdown ended;[2] and to offer views across central London, including Battersea Power Station and Canary Wharf.

[12][13] On 13 August 2021, the deputy leader of Westminster City Council and project lead Melvyn Caplan resigned in the wake of the cost increase.

Council leader Rachel Robathan described the almost doubling in cost as "totally unacceptable" and a review was launched to "understand what went wrong and ensure it never happens again".

"[2] It was compared to the hill from the children's show Teletubbies, and landscapes from computer games such as The Sims, Super Mario 64 and Minecraft.

[18] The mound remained open to the public until 9 January 2022,[19] after which time a four-month dismantling process began[20] at a cost of £660,000.