Eternal Spark,' a Bilgin 163-foot superyacht, was primarily designed for charter but brings a rather outlandish design to the ...

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.

Arranged across three floors, the most important new element was a new location for the staircase. S+PS removed the original and added in a spiral stair, a ‘primary protagonist’ that unites the space ...

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 ...