While in Toyama I took some pictures of Toyama Castle, and here's some shots of it since it was shown in Kuromukuro.
Image from Episode 3 - 04m10s
Toyama Castle is also known as Azumi Castle, which is what Kennosuke calls it in the show.
Image from Episode 3 - 05m52s
The castle is lit up at night.
Image from Episode 3 - 05m47s
Slightly closer shot.
While in Toyama I also saw Kuromukuro ads in the trams.
And the local Animate store had a section with P.A. Works goods, including some from Kuromukuro.
No map since this is a famous tourist attraction.
This location was visited on 2016/10/08. The tram picture is from 2016/10/09 and the Animate one from 2016/10/12.