Limestone tunnel in Big Room of Carlsbad Caverns. New Mexico, December 26, 2007
Underground tunnel connecting Gatchina Palace with Serebrianoe Lake, near Saint Petersburg. Russia, December 23, 2005
Green arbor tunnel in Letny Sad (Summer Garden). Saint Petersburg, Russia, September 4, 2016
Gull Rock Tunnel of Cliff Walk trail in Newport. Rhode Island, May 16, 2004
Green arbor tunnel in Letny Sad (Summer Garden). Saint Petersburg, Russia, October 21, 2016
View of Rosh Hanikra, with a railway tunnel (now closed). The Middle East, September 7, 2000
Underground passage of Western Wall Tunnel near its northern end. Jerusalem, the Middle East, October 31, 2002
Rough Point, New Lodge and Ocean View mansions from Cliff Walk at Sheep Point, behind Gull Rock tunnel. Newport, Rhode Island, August 24, 2003
PATH tunnel (commuter railroad) in the bathtub (basement) wall of World Trade Center, view from West Street. New York City, March 18, 2007
Rough Point, New Lodge and Ocean View mansions from Cliff Walk at Sheep Point, behind Gull Rock tunnel. Newport, Rhode Island, March 15, 2003.
Underground tunnel connecting Gatchina Palace with Serebrianoe Lake. Gatchina, suburb of Saint Petersburg, Russia, February 12, 2013
Underground tunnel connecting Gatchina Palace with Serebrianoe Lake, view to the south. Gatchina, suburb of Saint Petersburg, Russia, February 12, 2013
A passage with flowing water of Hezekiah s Tunnel under the City of David. Jerusalem, the Middle East, July 12, 2001
Arbor tunnel in Letny Sad (Summer Garden). Saint Petersburg, Russia, September 4, 2016
Rough Point, New Lodge and Ocean View mansions from Cliff Walk at Sheep Point, behind Gull Rock tunnel. Newport, Rhode Island, August 24, 2003
Rough Point, New Lodge and Ocean View mansions from Cliff Walk at Sheep Point, behind Gull Rock tunnel. Newport, Rhode Island, February 5, 2004.
A tunnel to water cisterns north-west from Temple Mount (?) in Jerusalem. The Middle East, August 5, 2000
Christmas light tunnel decoration "Santa s Lane" in Central Park at rain. College Station, Texas, December 29, 2009
Pedestrian tunnel of 1400 Smith Street Building. Houston, Texas, January 21, 2008
Rough Point, New Lodge and Ocean View mansions from Cliff Walk at Sheep Point, behind Gull Rock tunnel. Newport, Rhode Island, February 5, 2004.
View in direction to Rough Point from Cliff Walk at Sheep Point, behind Gull Rock tunnel. Newport, Rhode Island, February 5, 2004.
Gull Rock tunnel at Cliff Walk trail in Newport. Rhode Island, March 18, 2004
Tree with a web tunnel on Racoon Run Trail in Lick Creek Park. College Station, Texas, July 17, 2013
Underground tunnel connecting Gatchina Palace with Serebrianoe Lake. Gatchina, suburb of Saint Petersburg, Russia, May 17, 2015
A marker of a tunnel under Route 27 to towpath in Delaware and Raritan Canal State Park. Kingston, New Jersey, April 16, 2007
Micro-tunnels left by leaf miners. Heritage Trail in Lafayette, near Battle Ground, Indiana, May 16, 1999.
Green tunnel in Letny Sad (Summer Garden). Saint Petersburg, Russia, September 4, 2016
Web tunnel in Antique Rose Emporium. Independence, Texas, September 28, 2018
Tunnels of bark beetles on a dry standing tree in Lick Creek Park. College Station, Texas, January 25, 2023
Maze of tunnels of bark beetles on a dry standing tree in Lick Creek Park. College Station, Texas, January 25, 2023
Texture of tunnels of bark beetles on a dry standing tree in Lick Creek Park. College Station, Texas, January 25, 2023
Yellow corticioid fungus Hypoxylon rubiginosum together with is brown anamorph (asexual stage) around tunnels of bark beetles on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Thin yellow crust of corticioid fungus Hypoxylon rubiginosum around tunnels of bark beetles on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Details of thin yellow crust of corticioid fungus Hypoxylon rubiginosum around tunnels of bark beetles on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Close-up of thin yellow crust of corticioid fungus Hypoxylon rubiginosum around tunnels of bark beetles on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
El Capitan, Half Dome and valley of Tenaya Creek from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
Area of Yosemite Village from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
Valley of Merced River from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
El Capitan (2307 m), Half Dome () and Sentinel Dome from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
El Capitan and valley of Merced River from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
One-way colour tunnel by Olafur Eliasson in San Francisco Museum of Modern Art. San Francisco, California, March 18, 2024
Growth of Hemisphaeric liverwort (Reboulia hemisphaerica) on Tunnel Trail in Fort Boggy State Park. Leon County, Texas, February 1, 2025
Hemisphaeric liverwort (Reboulia hemisphaerica) on a forest clearing on Tunnel Trail in Fort Boggy State Park. Leon County, Texas, February 1, 2025
Trees on Tunnel Trail in Fort Boggy State Park. Leon County, Texas, February 1, 2025
Birch Tunnel of Alley of the Red Hill (Alleya Krasnogo Bugra) in Pavlovsk Park during the "Golden Autumn" season. Pavlovsk, a suburb of Saint Petersburg, Russia, October 6, 2025
Tunnel-like quality of the linden alley, a hallmark of 19th-century Russian park design. The interlocking branches of the mature linden trees (Tilia) form a "gothic arch" overhead, completely enclosing the path. This creates a sense of protection and separation from the outside world, which aligns with the secluded, monastic theme of the nearby Feodorovsky Gorodok. Pushkin (former Tsarskoe Selo) near Saint Petersburg, Russia, October 10, 2025
Soykinskaya Alley (or Road) in Oranienbaum Park. This is a major thoroughfare in the Upper Park, notable for its impressive width and the straight, long perspective it creates, reminiscent of the "prospekts" designed in the 18th century. The alley is flanked by mature, stately trees--predominantly oaks and lindens--whose canopies form a "golden tunnel" overhead. The fallen leaves completely cover the ground, creating a continuous carpet of orange and yellow that mirrors the canopy above. Oranienbaum palace-and-park ensemble in Lomonosov (a suburb of St. Petersburg), Russia, October 13, 2025
Linden alley in Oranienbaum Park. Mature linden trees form a dense, golden tunnel overhead. The long, converging lines of the tree trunks draw the eye toward the distant tractor, emphasizing the scale of the park (which covers over 160 hectares) and the ongoing maintenance required to preserve its historic appearance. Oranienbaum palace-and-park ensemble in Lomonosov (a suburb of St. Petersburg), Russia, October 13, 2025
The park s blend of formal structure and natural landscape during autumn. The image captures a long, straight avenue typical of the park s 18th-century layout, creating a mesmerizing "tunnel" effect. :200b Oranienbaum palace-and-park ensemble in Lomonosov (a suburb of St. Petersburg), Russia, October 13, 2025
A gently rising road leading toward Leuchtenberg Palace, drawing visitors uphill through a tunnel of golden autumn foliage in Sergievka Park. Old Peterhof, west from Saint Petersburg, Russia, October 13, 2025
Mixed forest path, where the untamed woodland creates a natural tunnel of "Golden Autumn" foliage. Sergievka Park near Universitet, Old Peterhof, west from Saint Petersburg, Russia, October 13, 2025
Tunnel Trail in Fort Boggy State Park. Leon County, Texas, February 21, 2026
