Fort Funston visitors beware: A World War II era structure fell off a cliff and landed on the beach

A century-old military structure slid down a rain-drenched bluff at Fort Funston Monday morning and dropped onto the beach below, according to the Golden Gate National

Recreation Area. In a photo posted by park officials to Twitter, a block structure appears to have landed upside-down in the sand below the cliffs, deposited there by a

slide of dirt and rock. The structure tumbled off the cliff around 10 a.m. Monday and slid about 200 feet, according to the San Francisco Fire Department, which responded

to the incident. There were no injuries. Park officials warned visitors to the area to follow posted advisories and be wary of their surroundings as the saturated ground

shifts and settles due to recent storms. Fort Funston remained open on Monday. It was not immediately clear what type of building had fallen onto the beach. The online post

described it as a “WWII military structure.” Fort Funston is a popular destination for tourists and residents, located in the southwest corner of San Francisco. The site

was established as a military outpost in 1900, but the first structures began going up in 1917. During the Cold War, the site housed one of the Bay Area’s 12 missile defense

installations. The fort was deactivated in the 1960s and handed over to the National Park Service. The site is administered by the Golden Gate National Recreation Area.

Erin Allday is a San Francisco Chronicle staff writer. Email: Twitter: @erinallday