In 2011, archaeologists rediscovered an ancient “gate to hell” in the city of Hierapolis, Turkey. This stone doorway leads to a small cave-like grotto and was once thought to be an entrance to the underworld. The gate, also called the Plutonium, sits above a fissure that releases deadly volcanic carbon dioxide (CO2). Visitors to the site in ancient times would see a visible mist of this gas rising from the ground. Even today, the area is dangerous—birds that fly too close to the gate suffocate from the toxic fumes. The city of Hierapolis is just one of many places on Earth where you aren’t welcome, but can still check them out in our video.
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CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/:
King Farouk palace: By Redthunder22, https://commons.wikimedia.org/w/index.php?curid=35558298
Niihau helicopter: By Christopher P. Becker, https://commons.wikimedia.org/w/index.php?curid=116402239
Erdstall Ratgöbluckn Perg Durchgang: By Pfeifferfranz, https://commons.wikimedia.org/w/index.php?curid=18819687
Erdstall Perg: By Pfeifferfranz, https://commons.wikimedia.org/w/index.php?curid=13965248
Trca2: By Tomasz Majtyka, https://commons.wikimedia.org/wiki/File:Trca2.ogv
CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0:
Bhangarh: By Deejayrocks2, https://commons.wikimedia.org/w/index.php?curid=82674759
Shirazumori Shrine: By Fred Cherrygarden, https://commons.wikimedia.org/w/index.php?curid=149066912
Yawatano-yabusirazu Motoyawata: By しんぎんぐきゃっと, https://commons.wikimedia.org/w/index.php?curid=93493917
Blair Witch Project Logo: By Schreibwerkzeug, https://commons.wikimedia.org/w/index.php?curid=56293706
GuilfordCT Dudleytown: By Magicpiano, https://commons.wikimedia.org/w/index.php?curid=68150500
Erdstall Vorau: By Haweb, https://commons.wikimedia.org/w/index.php?curid=128796249
Hermann Schwammenhöfer: By Hermann Schwammenhöfer – https://www.academia.edu/70468036/Hermann_Schwammenh%C3%B6fer_Arch%C3%A4ologische_Denkmale_Weinviertel_Wien_2020_, https://commons.wikimedia.org/w/index.php?curid=130719435
FMP – Erdstall: By Wolfgang Sauber, https://commons.wikimedia.org/w/index.php?curid=69517607
Bhangarh Fort: By Chainwit., https://commons.wikimedia.org/w/index.php?curid=121287181
The Plutonium: By Carole Raddato, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, https://flic.kr/p/Q35dZY
Erdstall waagrechter schlupf: By Josef Weichenberger, GFDL, https://commons.wikimedia.org/w/index.php?curid=29649747
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