Flickr-like responsive photo gallery for Drupal 8
Drupal 8 has built-in Picture module with support of responsive images.
So you need to create new content type "Photo" with image field.
Add some photos of new content type.
Create new view of type "Grid List" and add Photo image field to display.
Or create new view of type "Unformatted", add Photo image field to display, then remove default field formatting, modify CSS.