The Pioneer Cabin tree is a giant sequoia tree with a hallowed-out center that has drawn thousands of visitors over the years who wish to stand "inside" the tree. Cars were even allowed to drive through the tree at one point, but in recent years it was only accessible to hikers.
The tree toppled over on Sunday during a heavy rainfall, according to the nonprofit group responsible for the tree. A volunteer for the Calaveras Big Trees State Park, about 90 miles east of Sacramento, said that it was "barely alive" prior to the storm.
"The Pioneer Cabin tree has fallen," the group posted on Facebook. "This iconic and still living tree - the tunnel tree - enchanted many visitors. The storm was just too much for it. Thank you, Jim Allday, for the word and the photos."
Jim Allday, a volunteer at the park, told SFGate that the tree went down around 2 p.m. and "shattered" when it hit the ground.
"When I went out there (Sunday afternoon), the trail was literally a river, the trail is washed out," Allday said. "I could see the tree on the ground, it looked like it was laying in a pond or lake with a river running through it."
There is no official record of the tree's age, but many other sequoias in the park are over 1,000 -- they can live to be more than 3,000 years old.