Sky Garden

You're standing 525 feet above the City, cradling a drink while St Paul's Cathedral sits at eye level. Sky Garden, tucked inside the distinctive Walkie Talkie building on Fenchurch Street, is one of London's best-kept secrets—genuinely free entry, no booking required (though you'll need to register ahead online). The triple-height space wraps around actual plants and trees, giving it an unexpectedly lush feel despite the soaring views across to Canary Wharf and beyond. Hit it on a clear evening when the light's golden and the whole of East London glitters below you.