Imperial War Museum, London, 19 July - 8 March 2015
The reopening of the capital’s Imperial War Museum is this week’s major cultural event. As well as designing the museum’s new galleries dedicated to the First World War, to mark the conflict’s centenary, Norman Foster RA has designed a breathtaking atrium in which fighter jets hang from the ceiling (the Academician himself is an avid aviator).

The new galleries present Truth and Memory, the most comprehensive presentation of British First World War art for almost a century. The exhibition and its key theme of remembrance are examined by painter Hughie O’Donoghue RA in the current issue of RA Magazine. Read his beautifully written piece, which also discusses O’Donoghue’s own work about war, currently on view in both Westminster Abbey and Eton College.

Hauser & Wirth, Somerset, until 2 November 2014
London, New York, Zurich, Bruton: spot the odd one out. Three are major capital cities known for their thriving internationalist art scenes, and one is a small West Country town, whose museum focuses on local history. But from this week all of these locations feature a Hauser & Wirth gallery, now that the blue-chip art dealer has transformed Durslade Farm, on Bruton’s outskirts, into an arts centre.

The inaugural exhibition is by sculptor Phyllida Barlow RA, known for anarchic installations of the most everyday of materials – Durslade’s barn, for instance, has bright fabric pompoms suspended from its rafters. Other features of the centre are an extensive array of events, a top-notch residency programme (with Turner Prize-winner Mark Wallinger the current participant) and a restaurant that sources its food in a five-mile radius from Durslade.

White Cube Bermondsey, London, until 28 September 2014
Happily connected by ampersand for near fifty years, Gilbert & George present their latest paintings at White Cube from this week. The British artist-duo are self-declared “living sculptures”, their own forms either represented in their art or constituting the works themselves. Their latest series of ‘Pictures’ – large-scale manipulated photographs – sardonically juxtapose their two persons with falling bombs, religious iconography and urban signifiers from hoodies to billboards.

Blain|Southern, London, until 27 September 2014
Mayfair’s Blain|Southern brings together some big names for its summer group exhibition, including Italian avant-gardists Lucio Fontana and Michelangelo Pistoletto, German painter Gerhard Richter and major figures in American art such as Donald Judd, Carl Andre, Gordon Matta-Clark, Lawrence Weiner, Bill Viola and James Turrell. The theme that links all the works on view is “the void”, a particularly key concern for British sculptor Rachel Whiteread, who is represented by a cast of the negative space around a shelf of books.

Salisbury Cathedral, Salisbury, until 23 July 2014
Wednesday is the last day to enjoy the wonderful works in stone that have been set around Salisbury Cathedral by John Maine RA. The presentation comprises almost twenty sculptures, ranging from columns to pavement to low smaller works in granite, sandstone and Portland stone. Like all of Maine’s sculpture, they carry a deep sense of timelessness, as if their abstract forms were ancient relics, visitors from the future or, perhaps, made as one with the cathedral’s 13th-century architecture.

Sam Phillips (@SamP_London) is Editor of RA Magazine.