Travellers frequently skip a country's second city on the assumption that it is a smaller version of the capital. It is usually a different kind of place, with a distinct set of things to offer.
Capitals attract, second cities produce
A capital accumulates national institutions, administration and international business, which draws people from everywhere and shapes the city around arrivals and visitors.
Second cities more often grew around a specific industry, a port, a river or a resource, and that origin remains legible in the street layout and the buildings.
The result is a place with a clearer character, because it was built to do something rather than to represent everything at once.
Food culture is frequently stronger
Capitals offer breadth, with cuisines from across the country and the world represented, but the depth of any single regional tradition is often diluted.
A second city usually sits inside one food region and cooks it seriously, supplied by producers within a short distance and judged by customers who know the standard.
Prices tend to be lower as well, since the rent structure and the customer base are both different from a capital's centre.
Civic life is more accessible
Museums, orchestras, theatres and universities in a second city are generally easier to get into, cheaper, and considerably less crowded than their capital equivalents.
Their collections are often surprisingly strong, having been built during periods of industrial wealth when regional cities competed with the capital directly.
Because they serve a local audience rather than a tourist one, the programming reflects what the city is interested in rather than what visitors expect.
Rivalry is a useful guide
Second cities almost universally define themselves against the capital, and that rivalry shows up in sport, dialect, humour and a persistent sense of being underestimated.
Asking a resident what the capital gets wrong is a reliable way into a conversation, and the answers usually point at things worth seeing.
The distinctiveness is genuine rather than performed, since it grew out of a real economic and political relationship sustained over a long period.
Practicalities favour the detour
Accommodation is cheaper, restaurants are easier to book at short notice, and the walkable centre is often smaller and more coherent than a capital's sprawl.
Rail connections between principal cities are usually the best in a country, which makes adding one to an itinerary cheap in time as well as in money.
For a trip built around a coast, the regional city is frequently the port that the coastline served, which makes it the place where the whole region's history is explained.