Maybe I can add a slightly other perspective. When traveling to a strange country you will often find many many opportunities to take interesting and memorable photographs. So many, that if you have a reasonable range, like with your 14-30 and 24-120, you will (mostly) not miss the larger focal lengths. Because you already take 100’s of photographs.

Map your photographic opportunities versus your focal lengths.
So unless you specifically expect interesting things for you in the 200-400mm range that would be my advice.
Personally, last summer I went on holiday to the baltic states (I am a Dutchman) and brought my 17-28, 24-120 and AF-S 70-300 with me. The latter one I barely used, only some birds in a nature reserve. The 24-120 was enough to also capture more interesting architectural details in the cities. Sure, I would have liked a bit more length for that purpose, but it was enough. I really loved this lens. Using a lens which you love is perhaps also a consideration. All in all, I would say that more then 90% of my photographs were taken with the 24-120.
Later I bought the 24-200 additionally, and for me it felt like not much added value compared with the 24-120, and I could not get warm for this lens, other then a one lens have always with you sort of solution. When the 28-400 came out I immediately sold the 24-200 and the older 70-300, and bought the 28-400. I still have to think if I going to use it as my one lens hiking solution in the mountains, for the moment I enjoy it for birding. I am not sure if i would add it as a 3 lens solution for future use: 17-28, 24-120, 28-400, but that could be a possibility. I would love the 100-400 but find it expensive and heavy, and I am not sure how often I would use it.
my 2 cents.