1. Golden Gate Bridge, San Francisco
Superlatives flow when describing this world-famous landmark. It is the third-largest single-span bridge ever built, and, when it was erected, it was the longest and tallest suspension structure. Named after the part of San Francisco Bay dubbed “Golden Gate” in the mid-19th century, the bridge opened in 1937. There are breathtaking views of the bay from this spectacular structure, which has six lanes for vehicles as well as a pathway for pedestrians and cyclists.