We're going to Europe next year with kids aged 4.5 & 2.5, visiting major cities such as London, Paris, Venice, Florence & Rome.Obviously both kids will tire when walking around town and walking around attractions such as museums etc.
I would love to hear what people found worked best. Did people find strollers or backpacks worked well? Or were they more hassle than they were worth - e.g. getting on planes/trains/buses/taxis.