Spain is the most diverse country in Western Europe. Catalonia (Barcelona) feels closer to France than to Andalusia (Seville, Granada); the Basque Country (San Sebastián, Bilbao) is a world of its own with its own language and the best food in the country; and the islands — Mallorca, Ibiza, the Canaries — are a separate beach-holiday economy. A good Spanish trip picks one or two of these and goes deep.
The food is the reason many people come back. Tapas in Madrid, pintxos in the Basque Country, paella in Valencia, jamón in Andalusia. The eating culture is built around sharing and socializing, not courses — you stand at the bar, order small plates, and move on.
Spain is also cheaper than France or Italy, especially outside Madrid and Barcelona. Hotels, meals, and wine are all lower, and the quality is very high. This makes it one of the best-value countries in Western Europe.
Spain suits families, couples, food lovers, and beach travelers. The mistake is trying to do Madrid, Barcelona, and Andalusia in one week — the distances are real. Pick two regions and enjoy them.