The secret passage known as the Corridoio Vasariano connects the Uffizi Gallery to the Palazzo Pitti via the Ponte Vecchio, and it has been closed for extensive renovations since 2016. The reopening was originally scheduled for 2022, but the latest news is that it will reopen in the first half of 2023. It’ll be for one way foot traffic only, departing from the Uffizi end. Whether it will require a separate ticket is not yet clear.