The term "nuisance" typically describes something that annoys people, but in legalese, the word can also mean something that poses danger. Taking the concept a step further, the term "attractive nuisance" refers to something that poses danger, but is attractive to children.
A common type of accident we handle in premises liability law concerns slipping and falling in public stairwells. Typically, when people approach a set of stairs in a public place they immediately look for handrails. When they see a handrail, people tend to assume the stairs are safe and proceed confidently.