There is a photo contest by 
Every week on Sunday a new round starts and the motto is announced.
To participate, you have to publish a post according to the theme, then leave a comment and a link in the contestpost and use the tag #pobphotocontest.
There are POB tokens to be won, which will be distributed as rewards for the published post.
Also 
So it's worth joining in there.
This week's theme is bridges and here is my contribution.
We were on a hiking trail in Luxembourg and saw this little bridge.
The path often went through small gorges and crevices. In this case, a small path went up after the rock and led over this bridge.