We've got our art in the wrong place... unusual exhibitions around London

Fortnum's x Frank

To many of us, the Queen's grocer Fortnum's spells high tea, hampers and lavender biscuits in quaint tins.

This autumn, however, the 310-year-old Piccadilly institution is hosting some of the biggest names in British art. Work from Frank Auerbach, Tracey Emin, Howard Hodgkin, Keith Vaughan, Bridget Riley, Leon Kossoff and many more

Bill Viola: 'Mary' St. Paul's Cathedral

Two years ago, American video artist Bill Viola installed two giant plasma screens in London's greatest edifice, St. Paul's Cathedral, showing video work on the theme of the Martyrs. It remains in the south quire to this day. This autumn, a second permanent large-scale installation will come to the cathedral, it has been announced. Mary will show the Virgin Mother carrying Christ, and will be installed in the north quire

The Line: East London's Sculpture Walk

Sculptures from Martin Creed, Gary Hume, Damien Hirst and the fabulous Abigail Fallis line these three trails. London's answer to New York's 'High Line' connects little-known parts of the River Lea to North Greenwich and the Royal Docks. It makes for a fabulous afternoon.

The Ethics of Dust, Artangel and Jorge Otero-Pailos, Westminster Hall

Everyone has been raving about The Ethics of Dust, a work in Westminster Hall by Spanish artist, architect and conservationist Jorge Otero-Pailos. Pailos made a cast of the east wall of the thousand-year-old Westminster Hall using latex. This application process can be used carefully to clean and restore old buildings.

With all that has happened in British politics from the end of June, to see this sheet hanging there like parliament's dirty laundry should be an arresting pilgrimage for those interested in current affairs and history alike.

Ron Arad sculpture, St Pancras Station

Next time you're popping on the Eurostar, look up. Israeli sculptor Ron Arad's has unveiled his cleverly-titled Thought of Train of Thought. It's an 18-metre twist of aluminium that rotates slowly above the arrivals from the Eurostar, reflecting them from above. Part of the Royal Academy's ongoing sculpture collaboration, with the station, the piece shimmers as it rotates, offering, quite literally, a moment of reflection.

Bedlam, Wellcome Collection & 'Reclaiming Asylum' Bethlem Gallery

Bethlem Hospital. 'Bedlam'. A place so frightful its name has come to mean uproar, or chaos. An upcoming Wellcome Collection exhibition will explore this 600 year old institution as well as our changing notion of 'madness', from Bedlam to the present day.

A parallel exhibition, Reclaiming Asylum, will pop up over at Betlhlem Gallery - a space situated on the grounds of The Bethlem Royal Hospital.

Wheeeee! Carsten Höller's new Olympic Park slide

Carsten Höller has wrapped one of his famous slides around Kapoor's ailing Olympic Park sculpture. We were one of the first to have a go. And we can't recommend it enough.

This isn't your average playground affair: we're talking 178 metres long 76 metres high. Twists, turns, vertical drops, helmets. You're given a sack to lie in, told to tuck your elbows in and then whooosh, down you go, plunged in and out darkness, speeding along, no idea which way is up or down.

INSIDE, Artists and Writers in Reading Prison

Okay, Okay. So this one's in Reading. But it's worth it, we promise. This September, for the first time ever, Reading Prison will open to the public, where some of the biggest names in art and performance respond to themes of isolation, imprisonment and Oscar Wilde - the jail's most famous inmate.

Expect works by Marlene Dumas, Nan Goldin, Steve McQueen, Wolfgang Tillmans to be installed in the Victorian prison’s corridors, wings and cells. Each Sunday, writers and performers including Ralph Fiennes, Maxine Peake, Patti Smith, Colm Tóibín and Ben Whishaw will perform Wilde's work.

Sculpture in the City 2016

Let's be honest. Province of bankers and brokers, Gherkins, Cheese-graters and a thousand Pret A Mangers: the Square Mile isn't the first place you'd look to find a host of arresting artworks.

And yet, every year, The City of London takes contemporary art out of its natural habitat and places it in surprising corners of the Financial District.

This year we have Sarah Lucas, Gavin Turk, Antony Caro and Jaume Plensa.

St. Paul's Cathedral on Fire

To mark 350 years since the city was gutted by the Great Fire of London, some of our most iconic buildings wills be lit on fire. From the 1-4 September, artist Martin Firrell will set fire to the National Theatre and St Paul's Cathedral with blazing projections.

On the 4th September, as a grand finale, a vast 120-metre-long wooden sculpture of Restoration London will be set alight along the Thames.