Hum (Italian: Colmo) is a tiny town in the central part of Istria, north-west Croatia, seven kilometers from Roč, 14 km southeast of Buzet on a hill above the Mirna valley. The elevation of the town is 349 m. This small fortified habitation has maintained all the features of mediaeval urban architecture and organization.
With a population of only 17 people, it was named the smallest town in the world by Guinness World Records, notwithstanding that many places actually have smaller populations.
I do not know why a town of five families as two RC churches. The above is taken from the one outside the town. Below is the one within the walls.
Yours truly in the Hum main street.