This is the Coit Tower in San Francisco.

Coit Tower, also known as the Lillian Coit Memorial Tower, is a 210-foot (64 m) tower in the Telegraph Hill neighborhood of San Francisco, California. The tower, in the city's Pioneer Park, was built in 1933 using Lillie Hitchcock Coit's bequest to beautify the city of San Francisco; at her death in 1929 Coit left one-third of her estate to the city for civic beautification.

Although an apocryphal story claims that the tower was designed to resemble a fire hose nozzle due to Coit's affinity with the San Francisco firefighters of the day, the resemblance is coincidental.

Lillie Hitchcock Coit, born in 1843, was a well-known mascot of the San Francisco's firefighters. When Lillie was 15 years old, she witnessed Knickerbocker Engine Co. No. 5 respond to a fire call on Telegraph Hill when they were shorthanded, and helped them get up the hill ahead of other competing engine companies. Of course, this wasn't enough to write her name in history, but her bequest did its work. Now the tower is a popular place among tourists.

More Info: en.wikipedia.org