More than 150 historic buildings — theaters, breweries, mansions, cathedrals, hotels, museums — are open to the public, and many offer free guided tours.
More than three dozen in-depth walking tours also are offered but sell out quickly.
This year, the event is virtual.
The first North American town to be named a UNESCO City of Literature offers talks, readings, panels, exhibits and a walking tour of literary Iowa City.
This year, events and readings are online.