Time Out says
Opportunities to work up a sweat on the London tourist circuit are usually limited to queuing for Madame Tussauds in July. But the London Landmarks Half Marathon offers a chance to check out the sights, get some exercise and raise money for charity.
Founded in 2018, it’s the only half-marathon to go through both the City of London and Westminster on closed roads, giving runners a unique route past icons such as Big Ben, St Paul’s Cathedral and the London Eye. For spectators, it’s a great day out with plenty of race-day entertainment. Catch performances from singers, dancers and musicians, take a free guided history tour, discover under-the-radar sites like the house where the Gunpowder Plot was hatched and meet some historic and fictional Londoners, with a tribute to the world of Harry Potter. It’s a one-day transformation of central London, and you can enjoy it even if you couldn’t run a bath.