T he Boeing 747 is one of the most recognizable aircraft ever, with a second deck at the front of its fuselage and four ...

B PIÙ s.r.l., an Italian company that specializes in cutting, folding and welding of a variety of materials, patented the Eclettica spiral staircase in 2011. The staircase can be designed in a variety ...

The Loretto Chapel’s spiral staircase, built without nails or central support, remains a 140-year-old mystery. Was it divine intervention, lost craftsmanship, or a miracle of engineering? ✨🏛️ ...

From spirals to floating steps, interior designers share some of the most common outdated stair trends they see in homes.