vancouver skyline
Some venues offer the opportunity to have the wedding conducted on the rooftop of buildings. Great as it is, there could be noise from nearby air conditioning equipment as well as street traffic. Surrounding buildings can cast large shadows that doesn't make for good photos and videos.

Also, be sure position your bridal party as well as the guests out of direct exposure to sunlight for too long. It may be great for taking photos and videos, but could be too bright and sweltering hot, especially for the bride and groom.