Editing Tunnel (section)

== Natural tunnels ==
[[File:Yongmun-gul at Daedunsan.jpg|thumb|upright|View through a natural tunnel in South Korea]]
* [[Lava tube]]s are emptied lava conduits, formed during volcanic eruptions by flowing and cooling lava.
* [[Natural Tunnel State Park]] (Virginia, US) features an {{convert|850|ft|m|adj=on|order=flip}} natural tunnel, really a limestone [[cave]], that has been used as a railroad tunnel since 1890.
* [[Punarjani Guha]] in [[Kerala, India]]. Hindus believe that crawling through the tunnel (which they believe was created by a Hindu god) from one end to the other will wash away all of one's sins and thus allow one to attain rebirth. Only men are permitted to crawl through the tunnel.
* [[Torghatten]], a Norwegian island with a hat-shaped silhouette, has a natural tunnel in the middle of the hat, letting light come through. The {{convert|160|m|ft|adj=on}} long, {{convert|35|m|ft|adj=on}} high, and {{convert|20|m|ft|adj=on}} wide tunnel is said to be the hole made by an arrow of the angry [[troll]] Hestmannen, the hill being the hat of the troll-king of [[Sømna Municipality|Sømna]] trying to save the beautiful [[Lekamøya]]. The tunnel is thought actually to be the work of ice. The sun shines through the tunnel during two few minutes long periods every year.<ref>{{cite news |last1=Warholm |first1=Harald |date=10 November 2014 |title=Hobbyfotografen har ventet tre år på dette sjeldne blinkskuddet |trans-title=The hobby photographer has waited three years for this rare shot |url=http://www.nrk.no/nordland/jubler-over-sjeldent-blinkskudd-av-fjellet-torghatten-1.12034377 |access-date=13 November 2014 |work=nrk.no |language=Norwegian}}</ref>