Thanks Robert.
HDR is ideal for Landscape where there's very little or no movement in the scene and night Landscape is very rewarding because it picks up subtle detail that normal imaging methods can't display properly.
PS HDR is a standard item, you don't need a plug-in and it can be found in:
File | Automate | Merge to HDR...
Here you navigate to your folder containing the images you want to combine.
Highlight the images and go from there.
I always use RAW files.
It's important to have images that have enough difference in exposure so that PS can work with them.
In these images I've done here and also my
Luna Park set, I used around 13 frames on each !
All ranging from very quick exposure (1/5th sec) up to 2 minutes.
Hope this helps.