Nature Gallery

Hello Fabian,
I really liked you theme but I’m having some hard time implementing a Nature Gallery like you did in your example.
I did download the latest version from GitHub, But I do not understand which type of element creates a Nature Gallery like view.
Its not a post as I already noticed..

Can you please guide me?

btw, It would be super useful if in your example you would show which WordPress framework feature you used to create each on of the section..
If you could also provide the working example in your theme as a default it would have save tons of questions as well

Thanks for your hard work!

Asaf