Which country has Wellington as its capital?

Wellington took over from Auckland in the 1860s for a straightforwardly practical reason: as settlement spread down the South Island, a capital in the far north was awkwardly placed, and a harbour at the southern tip of the North Island sat much closer to the centre of the colony as a whole. The city grew around that deep natural harbour, hemmed in by steep hills that forced development onto reclaimed land along the waterfront and up narrow ridges, giving it a compact centre where parliament, the ministries and the national museum are within walking distance of each other. It also sits directly on an active fault system, so building codes there are unusually demanding, and it channels the winds funnelled through Cook Strait, which is why residents treat gales as ordinary weather. Auckland remains the larger city by a wide margin, which is what makes the question a reliable trap.

Wellington's cable car climbing from the central city to the suburb of Kelburn has been running since the nineteenth century.