San Francisco

San Francisco (SF), officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California. It is the birthplace of the United Nations. Located at the north end of the San Francisco Peninsula, San Francisco is about 47.9 square miles (124 km2) in area, making it the smallest county—and the only consolidated city-county—within the state of California. With a density of about 18,451 people per square mile (7,124 people per km2), San Francisco is the most densely settled large city (population greater than 200,000) in California and the second-most densely populated major city in the United States after New York City. San Francisco is the fourth-most populous city in California, after Los Angeles, San Diego, and San Jose, and the 13th-most populous city in the United States—with a census-estimated 2015 population of 864,816.

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California Academy of Sciences

The California Academy of Sciences is a natural history museum in San Francisco, California, that is among the largest museums of natural history in the world, housing over 26 million specimens. Th...

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Golden Gate Bridge

The Golden Gate Bridge is a suspension bridge spanning the Golden Gate strait, the one-mile-wide (1.6 km), one-point-seven-mile-long (2.7 km) channel between San Francisco Bay and the Pacific Ocean...

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Alcatraz Island

Alcatraz Island is located in San Francisco Bay, 1.25 miles (2.01 km) offshore from San Francisco, California, United States. The small island was developed with facilities for a lighthouse, a mili...