Serro is one of the old mining towns of Minas Gerais, smaller and quieter than nearby Diamantina but cut from the same stone, whitewash, and steep-street cloth. Its historic centre is protected for its colonial architecture and landscape, and the town still feels tied to the old Estrada Real rather than to the faster Brazil beyond the hills.
The pleasure here is not a long checklist. It is a slow day of churches, views, and houses that sit on sharp slopes above the valley. The Matriz de Nossa Senhora da Conceicao is the big baroque statement, while Santa Rita and Nossa Senhora do Carmo give the centre its best skyline moments.
Serro also has a food identity strong enough to travel for. The local cheese is one of Minas Gerais' classic raw-milk cheeses, sold in shops and markets around town and spoken of with the kind of pride usually reserved for football clubs. Come from Diamantina, stay long enough to walk the hills, and leave before trying to compare the two towns too neatly.