The Grotto del Cane in Naples:
"the Grotto of the Dog claimed our chief attention, because we had heard and read so much about it. Every body has written about the Grotto del Cane and its poisonous vapors, from Pliny down to Smith, and every tourist has held a dog over its floor by the legs to test the capabilities of the place. The dog dies in a minute and a half -- a chicken instantly. As a general thing, strangers who crawl in there to sleep do not get up until they are called. And then they don't either."
"the Grotto of the Dog claimed our chief attention, because we had heard and read so much about it. Every body has written about the Grotto del Cane and its poisonous vapors, from Pliny down to Smith, and every tourist has held a dog over its floor by the legs to test the capabilities of the place. The dog dies in a minute and a half -- a chicken instantly. As a general thing, strangers who crawl in there to sleep do not get up until they are called. And then they don't either."