Golden Gate Bridge

No photograph quite prepares you for the scale of it. The Golden Gate Bridge carries US-101 across the mile-wide strait between San Francisco and Marin County on two towers that rise 746 feet out of the water — taller than any building in the city when they went up in 1937. Stand at the south anchorage and the main cables overhead are as thick as a dinner table, spun from more than 27,000 individual wires. Walk out onto the deck and you feel the whole structure breathe: the roadway is designed to flex several feet in high wind, and on a blustery afternoon you notice it.

The colour is the other thing people underestimate. International Orange was never meant to be permanent — it was the primer shade on the steel when it arrived from the fabricators — but consulting architect Irving Morrow argued it complemented the warm hills and cool water better than the Navy's proposed black-and-yellow stripes. He was right. In fog, the orange glows. At sunset, it turns nearly red. A dedicated painting crew works the span year-round, and that maintenance is why an 89-year-old bridge still looks brand new.

For most visitors, the bridge is a walk rather than a drive. The eastern sidewalk is open to pedestrians and gives you the city-facing view — Alcatraz, the Bay Bridge, the downtown towers stacked behind Fort Point. It's roughly 1.7 miles to the Marin side, about 35 to 45 unhurried minutes each way, with the north tower as a natural turnaround if you don't want to commit to the full crossing. Cyclists get the western sidewalk on weekends, which is the ocean side and worth doing if you have wheels.

Underneath and around the bridge is a whole second attraction most people skip. Fort Point, the Civil War-era brick fortress tucked beneath the southern approach, survived only because chief engineer Joseph Strauss designed a special steel arch to span over it. Battery East and the old coastal gun emplacements in the Presidio give you the classic three-quarter view without any crowd at all. And the Presidio itself — 1,500 acres of former Army post turned national park — has enough forested trail, overlook and picnic lawn to fill an entire afternoon after your walk.