The 'comet of the century' was spotted in San Francisco, California, early Friday morning, and astronomers believe it will make another appearance in October. The beautiful spectacle was seen at ...

The Golden Gate Bridge's builders introduced many innovations, but perhaps the most impressive was the precise and efficient technique they used to construct the massive cables. The bridge's ...

The Golden Gate Bridge's vaulting, orange arches amidst the rocky seascape of the San Francisco Bay have made it one of the West Coast's most enduring symbols and the city's most popular tourist ...

Soaring 2,050 feet above the Beipan River, the 0.9-mile-long bridge rises an impressive nine times higher than San Francisco's iconic Golden Gate Bridge. The Huajiang Grand Canyon Bridge is seen ...