The number of missing bits at the famous stone circle by the A303 in Wiltshire was an obvious problem, and tests there by the team produced only a limited number of weak echoes and no noticeable reverberation. Ancient Britons would not have been terribly overawed by this, if the monument was built to impress. But luckily there is a full-sized replica in the United States.
Built out of concrete and erected at Maryhill, Washington state, as a memorial to US soldiers killed in the First World War, this revealed a wealth of special effects.
Story: The Guardian | Photo: Jason Hawkes/Getty