The Hotel del Coronado is a National Historic Landmark on the beach at Coronado, built in 1888 from wood by a crew that worked from architect's sketches delivered one floor at a time — because the drawings weren't finished before construction began. The result is a rambling Victorian confection of turrets, cupolas, and verandas that stretches along the beachfront for nearly a quarter-mile.
The hotel is still operating as a luxury resort. Non-guests can walk the public areas, browse the history gallery, and eat at the ocean-facing restaurants. The beach in front of the hotel is public. The main building's interior — the Crown Room dining hall especially, with its circular wooden ceiling assembled without nails — is worth seeing even if you're not staying.
The hotel is a fifteen-minute ferry ride from downtown San Diego, or accessible via the Coronado Bridge.