A tunnel tree is a large tree in whose trunk a tunnel has been drilled. This practice took place mainly at the end of the 19th and beginning of the 20th century in the west of the United States.^{[citation needed]}

The tunnel allowed tourists to walk or drive through the tree with a car. The tunnels were bored to boost tourism.^[1]

The tunnelling seriously damaged the health of the trees. As a result, some trees have fallen. Due to the harmful effects of hollowing out trees, the practice of creating tunnel trees has been abandoned.^[2]

List of tunnel trees

Name	Place	Tree species	Note	Picture
Wawona Tree	Mariposa Grove, Yosemite National Park	Sequoiadendron giganteum	Fell 1969
Pioneer Cabin Tree	Calaveras, Calaveras Big Trees State Park	Sequoiadendron giganteum	Fell 2017
Tunnel Log	Sequoia and Kings Canyon National Parks	Sequoiadendron giganteum	Fell 1937, blocking a road, a tunnel cut through the log in 1938
Chandelier Tree	Leggett	Sequoia sempervirens
Shrine Drive-Thru Tree	Myers Flat	Sequoia sempervirens
Klamath Tour-Thru Tree	Klamath	Sequoia sempervirens
California Tunnel Tree	Mariposa Grove, Yosemite National Park	Sequoiadendron giganteum
Dead Giant Tunnel Tree	Tuolumne, Yosemite National Park	Sequoiadendron giganteum