Cave of Dogs, Natural cave near Pozzuoli, Italy
The narrow cave entrance extends into a ten-meter corridor that slopes down to a cavity containing concentrated carbon dioxide emissions from underground fumaroles.
The earliest mention of this geological formation dates to 77 AD in Pliny the Elder's Naturalis Historia, documenting the presence of toxic gases.
During the European Grand Tour period, wealthy travelers visited the cave to witness demonstrations of carbon dioxide effects on small animals.
The cave sits behind Terme d'Agnano Hotel, making it accessible for visitors interested in exploring the geological features of Phlegraean Fields.
Carbon dioxide forms a 30-centimeter deep invisible gas lake at ground level, affecting only shorter creatures while remaining safe for standing humans.
GPS coordinates: 40.83330,14.16670
Latest update: May 16, 2025 10:21
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