The discussion centers around opinions on the best city skyline in the U.S. and Canada, with participants sharing images and personal preferences. Major cities highlighted include Boston, New York, Chicago, Los Angeles, Houston, Philadelphia, Seattle, Calgary, Vancouver, and Toronto. Seattle garners significant support for its scenic backdrop of mountains and water, while Chicago also receives praise for its skyline. Participants note that images should ideally be taken from similar distances and angles to provide a fair comparison. Some express disappointment over the exclusion of other notable cities like San Francisco, Dallas, and Pittsburgh from the initial poll options. The conversation evolves into a broader sharing of skyline images, with many contributors advocating for their hometowns and emphasizing the importance of lighting and perspective in skyline photography. Overall, the thread fosters a lively exchange of visual appreciation and personal experiences related to city skylines.