At 25 Cannon Street a free public garden reflects St Paul's dome in its pool, and a private roof garden opens for London Open Gardens. How to see both.

Sky Garden London is free at the top of 20 Fenchurch Street. How to book, when tickets are released, walk-in and ID rules, the view, the plants, and the building's melting-car past.

From the flat-on-the-river build in 1999 to cherry blossom in Jubilee Gardens, here is everything to know before you ride the London Eye.