These are my photos from parks I have visited (I didn't take them, they are all from Wikimedia Commons).
This shows you how to make a simple image gallery using articles in com_content.
In each article put a thumbnail image before a "readmore" and the full size image after it. Set the article to Show Intro Text: Hide.
Jörg Widmann VOST (FR)
Pascal Dusapin VO (FR)
Liza Lim VOST (FR)
Wolfgang Rihm VOST (FR)
Gérard Pesson VO (FR)
Olga Neuwirth VOST (FR)
George Benjamin VOST (FR)
Hugues Dufourt VO (FR)