I'm not going to reiterate what you can find a million places on the internet - if you want to know what LDS temples are and what their purpose is, I recommend going to the official LDS site or to www.mormon.org.
I don't have storage capacity to show you a picture of every temple;
for that I suggest this page or this page (my favorite.)But here is what I have to add:
List of temples in order of dedication, under construction, and even canceled projects.
