Spiral Staircases

The spiral staircases inside La Sagrada Família’s towers have two directions: clockwise going up, counterclockwise going down. In the extremely narrow confines, your body must hug the central curve to avoid colliding with visitors on the other side. Gaudí designed these in the late 19th century, without computers.

These spiral staircases are distributed through La Sagrada Família’s multiple towers, serving as the only path up to the viewing terraces. The circular steps cantilever outward with no central supporting column—the structural forces are sustained purely by the geometric tension of the helical surface itself. This form, called a cantilever helix, is regarded by engineers as one of the most difficult structures to realize.

Looking up from the base, you see a cross-section of an infinite snail shell, with each step forming an inward-spiraling ring. This visual effect is intentional: Gaudí studied the spiral growth patterns of mollusks extensively, believing this geometry to be one of nature’s most energy-efficient growth models.

The spiral staircases contain another of Gaudí’s hidden designs: the rotation direction of every staircase corresponds to the procession patterns of traditional Catholic liturgical ritual—ascent toward the sacred, descent back to earthly existence. Even a staircase became a religious metaphor.

Gaudí’s fixation on staircase direction also drew from medieval defensive castles—spiral staircases were traditionally designed clockwise going up so that right-handed defenders had the advantage when descending against attackers. Gaudí knew this history well, preserved the directional logic, and quietly layered religious meaning on top, allowing an ancient military rationale to persist inside a cathedral of peace.