Sky Gardens @ Fenchurch St
I love the unusual names given to the funny buildings in London; the cheese grater, the gherkin and the walkie talkie! I mean, who would expect a tropical garden, bar and restaurant to be at the top of a giant walkie talkie?! But this is somewhere I would definitely recommend visiting any time you're in London. If only to stop for a drink in the City Garden Bar and to take in the amazing views 155m up in the air, or if you have a bit more time, to have some food at one of the 2 restaurants available - 37 Fenchurch Restaurant and 36 Darwin Brasserie.
My boyfriend and I went to Fenchurch Restaurant for steak night (one of our fav things to do) and I was lucky enough to try Chateaubriand for the first time... Mind blown! Adding in Mac and Cheese and mash with truffle oil, this was a stunning meal. They also have an amazing selection of cocktails - I had strawberry cream... Yum!
There are set times for public walk in, but make sure to book ahead for dinner and to check out their website as they regularly have special events: https://skygarden.london