• It’s finally here. Open House London kicks off on Friday and with more than 800 buildings opening their doors, the only difficulty you’ll have this weekend will be choosing what you end up doing! This year’s theme is ‘celebrating architecture, people and place’ and among the highlights will be the opening of landmark structures like Battersea Power Station, Tower 42 (pictured), and the Gherkin (30 St Mary Axe) as well as 100 private homes, architects’ homes and “ground-breaking” housing developments and everything from the Shri Swaminarayan Temple in Brent to Horse Guards in Whitehall (certain buildings, like 10 Downing Street and The View from the Shard, are only open to people who won tickets in an earlier ballot). This year’s festivities also include a moonlit “culture crawl” through London on Friday night. If you haven’t ordered a hardcopy programme, you can check the listings online at www.openhouselondon.org. There’s also an Open House iPhone app available from the appstore.

• A series of works by Yinka Shonibare – including some never before seen in the UK – went on display at Greenwich yesterday, thanks to Royal Museums Greenwich. The works, which explore notions of “Britishness, trade and empire, commemoration and national identity”, can be found inside and around buildings including the Queen’s House, National Maritime Museum and Royal Observatory and include Fake Death Pictures – a series of five vision of the death of naval hero Vice-Admiral Lord Nelson, Wind Sculpture – a gravity-defying object located on the Queen’s House lawn, Cheeky Little Astronomer – a specially commissioned sculpture located in the Flamsteed House at the Royal Observatory, and Nelson’s Ship in a Bottle – last seen on Trafalgar Square’s Fourth Plinth. Yinka Shonibare MBE at Greenwich, which is supported by a range of talks, debates and tours, runs until 23rd February. For more, see www.rmg.co.uk.

• Bankside will be transformed this weekend as artists will be transforming disused hoardings and derelict buildings with original artworks as part of the Merge Festival. The work’s include Candy Chang’s Before I Die, Alex Chinnick’s Miner on the Moon, and Marcus Lyall and Mark Logue’s House of Pain. Until 20th October. For more on the festival celebrating Bankside, see www.mergefestival.co.uk.

• On Now: Michael Peto Photographs: Mandela to McCartney. This new exhibition at the National Portrait Gallery just off Trafalgar Square features a previously unexhibited photo of Elizabeth Taylor and Richard Burton, taken at the beginning of their love affair. It’s one of 10 portraits taken by the late Hungarian-born photographer Michael Peto in London during the 1950s and 1960s – others feature Samuel Beckett, Jennie Lee, Paul McCartney and Ian McKellen. Admission is free. For more, see www.npg.org.uk.