Thinking about where to retire is one way to get through a long work day.

It turns out lots of people do it, judging by readers at Topretirements.com. The retirement site, which President John Brady describes as the place "where Baby Boomers go to find their best place to retire," reviews places to retire, including many over-55 communities. Topretirements has been publishing its list of the 100 most popular places to retire since 2007. The list looks at the places that most of its online community members are looking at, talking about and living in.

Factors people care about when considering a retirement spot include weather (some like it hot; others like winter sports), history, arts and culture, cost-of-living, healthcare services, outdoor recreation resources and proximity to colleges and universities.

We took the top 30 cities that are home to more than 100,000 people to give you a few places to dream about.

Based on popularity at Topretirements.com, here are 30 top cities to retire: