Spain, Sized Right.
Three cities carry Spain's small group tours, and each one sets its own pace.
Barcelona keeps most of its small groups in the city and just outside it — a Gothic Quarter walk, a cava tasting after a 4WD run through Penedès, and two ways to see it all from above: an eleven-minute flight, or a slower pass by helicopter along the coast.
In Madrid, the day tends to end at a table. A tapas walk through La Latina that closes at a flamenco tablao. A gastronomic route through Las Letras, cava on a rooftop to finish. When the group does leave the city, it's for Ribera del Duero's wineries, with Segovia on the way back.
Seville is the one that doesn't stay put. Its small-group day trip spends more hours outside the city than in it — Córdoba's Mosque-Cathedral, the White Villages, and Ronda's gorge, all before the group is back for dinner.
The size isn't applied after the fact — it's part of what each tour was built to do. A Group Tour of 30 is built for distance. A Premium Small Group of 6 is built around one detail, seen close.