Venue! Whatever pictures you may have of it, whether they are other weddings they have shown there or what... this includes both your Ceremony and Reception venues if they are in different locations
FI and I are having a DW up in the Muskoka Lakes region of Ontario at a resort called Taboo Resort on Lake Muskoka, its GORGEOUS and so worth the travel!!!!
These are some overall pictures of the resort.

We are having the Ceremony on what is called the Fireside Patio. The first picture is of a wedding held there, the rest are pictures I took of the location, and the view from it, when we went on a planning trip last summer.

Our reception area is called The Pavillion. Its is a giant permanent tent that has a floor, heating/AC, its own kitchen, bathroom, chandaliers and the whole bit.

Lastly I have some pictures of the accomodations. They have two styles of rooms, half the resort is an more cabin/woodsy type feel, and the other half are done up more modern in blacks and greys. We will be requesting the first type, I like them better!