Golden Gate BridgeSan Francisco's International-Orange icon — a 1.7-mile walk or bike across the strait, free and open every day

When it opened in May 1937, the Golden Gate Bridge was the longest suspension span in the world — a 1.7-mile Art Deco crossing strung between two 746-foot towers over the deep, fog-prone strait that gives it its name. Chief engineer Joseph Strauss, with Charles Ellis and architect Irving Morrow, gave it the stepped towers, the slender cables, and the now-famous color: 'International Orange,' chosen over the Navy's preferred black-and-yellow stripes because it complemented the hills and stayed visible in the fog.

The best way to experience it is on foot. The east sidewalk runs free from the San Francisco anchorage out over the water to the Marin side — a windy, exhilarating 1.7-mile walk with the city skyline behind you and the Pacific opening to the west. Cyclists share the span and often continue down into Sausalito to ferry back. Below and around it, Fort Point sits in the bridge's southern shadow, Crissy Field stretches along the bay, and Battery Spencer on the Marin headlands delivers the head-on tower shot.

Come early for the clearest air — the summer fog (locals call it Karl) often swallows the towers by midday and burns off again at dusk. The Welcome Center on the SF side has exhibits, a section of original cable, and the gift shop; parking fills fast, so most visitors arrive by rideshare, bike, or the Presidio shuttle. Free, open every day, and unmistakable from miles away.