It's probably because our own towns and cities don't seem to have anything as visible as these that they fascinate me and I've been photographing them whenever I spot one for the last four years during my visits there.
They tend to be found on substantial buildings - banks, schools, city halls - but one surprise was spotting one at a railroad station. The shelters, when I've been able to ask, generally seem to be used as storage space nowadays.
The three examples below, all photographed earlier this month, are the first I've come across which still have the capacity figures still in place.
White River Junction railroad station. On the other side of the railway lines stands a former brick-built post office which also has its sign in place (but no capacity figure); there's a tunnel between the two buildings and the shelter is half-way between them, under the rail tracks.
A school in Salem city centre, Massachusetts.
Bank building in Millville, New Jersey.