Juxtaposition.
This is an interesting and often confusing word. An online dictionary defines it as:
jux·ta·po·si·tion
[juhk-stuh-puh-zish-uhn] Show IPA
noun
1. an act or instance of placing close together or side by side, especially for comparison or contrast.
2. the state of being close together or side by side.
I had always been taught that in photography, juxtaposition defined a composition that was in sharp contrast either in style, function or idea. Kind of like Beauty and the Beast.

I love this old forgotten home surrounded by equally forgotten wild miniature roses. I actually named this image Beauty and the Beast
Here are a few images I have that signify juxtaposition to me.

I love the metal cross atop the fence panel nestled against the Rose of Sharon. This actually more ironic than juxtaposed.
Have a great day!