Acquaviva, the western edge of San Marino facing San Leo

If you believe the local story, Acquaviva is where Saint Marinus first set foot in what became San Marino. It sits on the western side of Mount Titano, looking across to San Leo, and it has no towers or museums to speak of. What it does have is a founding legend the Sammarinese take seriously and a hilltop park where a castle used to be.

A name that comes from a spring

The castello’s official page explains that the saint baptised new believers with the clear water of a spring at the foot of Montecerreto, hence Acquaviva, «living water». I like it when a place name does the history lesson for you. Montecerreto was the old name, and the trees on the coat of arms still refer to it.

The same page goes further and places the Placito Feretrano here, the document the Republic long leaned on to argue for its independence, signed, it says, inside the hilltop fort in 885. I’m giving you the castello’s version, because historians don’t treat that as settled. You’ll find the wider background in the history of San Marino.

La Pineta, the castle that isn’t there

Not a stone of the Montecerreto fort is visible today. In its place is a wooded park the locals simply call La Pineta, which the government describes as untouched. With a car, I’d spend an hour walking up there before moving on, ideally in spring or early autumn. Don’t expect viewing platforms or information boards; it’s a village park.

Wikipedia puts the castello’s highest point at 414 metres and repeats a legend you’ll hear a lot in San Marino, that a cave in the Baldasserona cliff was the first hiding place of Saints Marinus and Leo. It also notes that on 19 December 1243 one Guido di Cerreto sold the Sammarinese his right to charge tolls at Cerreto and Ventoso, one of the small deals through which the country pieced its territory together.

Gualdicciolo and the Strada del Lavoro

The lower part of Acquaviva, Gualdicciolo, feels quite different. It’s flat, close to the roads into Italy, and grew up as a workshop and factory district. Five watermills once turned along the San Marino stream and gave families a modest living from the middle of the 19th century. The road is now known, fittingly, as the Strada del Lavoro, the «road of work», and according to the council it has 64 manufacturing firms employing 748 people.

It’s not a sightseeing stroll, but it helps you see that valley San Marino lives on industry rather than souvenirs. For a mill with its walls still intact, the Molarini mill is close by in neighbouring Chiesanuova.

Festivals and village life

The government’s official festival calendar for the castelli dates from 2024, when Acquaviva’s castello festival ran from 27 to 30 June, with the parish festival in early May and another in October. Nothing is out yet for 2026, so I’d look at the council’s page before travelling. For what’s on across the country, see San Marino’s events calendar.

The castello also has a shooting range at Ca’ Martino that the government says can host international competitions, and a toy library that local families use a great deal.

Getting there

By car it’s a short hop from Borgo Maggiore. By bus, AASS line 2 starts from car park P9 in the City and runs via Borgo Maggiore and Ventoso to Gualdicciolo and Molarini, on weekdays only. Outside those times the SMUVI on-demand service uses the regular stops and is booked through its app or by phone, and buses within the country were free of charge between March and the end of September 2026. Everything’s in getting around San Marino, and the other eight municipalities are in San Marino’s castelli.