Church of San Nicolo

San Nicolò is Treviso's great Dominican church, a vast brick hall near the western walls, and it holds the city's best art by a distance. Tomaso da Modena frescoed its columns in the 1350s, and the Seminary next door has his chapter house of forty Dominican scholars -- one of whom wears the earliest known depiction of eyeglasses in Western art.

These are fourteenth-century frescoes on plaster in a building with no climate control, and the no-flash rule is what has kept them readable. The chapter house limits visitor numbers for the same reason.

San Nicolò is an active parish church as well as an art site, and services take precedence.

It receives a fraction of the visitors that Padua's or Venice's equivalents do despite holding work of the same rank, so an hour spent here is genuinely worth more to Treviso than an hour spent anywhere else in it.

The church is free and open daily outside service times. The Seminary chapter house is entered separately, through the Seminary next door, and keeps its own restricted hours -- this is the single most-missed thing in Treviso, and worth checking before you go rather than after.

About ten minutes' walk west of Piazza dei Signori, and a similar distance from the station.