The Golden Gate Bridge was never supposed to be orange. The Navy wanted it black and yellow; the Army pushed for red and white, like a candy cane. It ended up "international orange" almost by accident, after the architect noticed the colour of the rust-prevention primer and liked what it did against the sky. That detail says a lot about a bridge that was never entirely planned and always slightly improbable.

When construction began in 1933, nothing of this scale had been attempted on the West Coast. Workers cooked hot dogs on thousand-watt lightbulbs suspended a thousand feet above the bay, and a safety net below the deck saved nineteen lives. Those survivors called themselves the "Halfway to Hell" club.

VoiceMap's self-guided audio tours walk you across the bridge, tracing the engineering story through the cable cross-sections, recounting the ironworkers' lives in their own words, and placing the bridge within the wider sweep of San Francisco's civic ambition.