66. Izu Islands, Japan
On the Izu Islands, the ever-present poisonous gases in the air are so strong that residents must carry gas masks with them. The moment the deadly gases rise to a dangerous level a special siren sounds to let everyone know they must immediately put on their gas masks. Scientists are not 100 percent certain but they believe these poisonous gases seep up through the earth and originate from a volcano beneath the island. The residents were evacuated in 2000 and all flights to this destination were canceled for over eight years.
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