One common-held theory is that spiral staircases were first installed in historic castles as vertical baffles, tiring out enemy infiltrators before they could make it to the top. This is why ...

or the business can specialize and manufacture specific styles of stairs, such as spiral, pull-down attic stairs, or rolling staircases for warehouse applications.

An curved arrow pointing right. An electric wheelchair that can climb most stairs, including spiral staircases, has been developed by Zurich-based students. Produced by Devan Joseph Follow BI ...

Carefully remodeled, the 2,271 square feet of main level and finished basement includes an upper-level loft built into the peak of the building frame, accessible by an unusual spiral staircase.