Spotting cute plants growing out of cracks in the pavement, in between bricks of a wall or high up on roof tops is something I really enjoy doing as I walk around a city. I love seeing how plants find a way to thrive regardless of humans building over every available surface with bricks and cement, or spraying sidewalks with toxic weed-killer.

The plants somehow just persevere and find new nooks and crannies to call their own. Like these stunning pink flowers that caught my eye, growing out of a guttter on the roof of a church in the center of Bilbao .

Or these plants and ferns that amazed me as they held on precariously to the top of this brittle stone wall in an alleyway in Santillana del Mar.