Rotorua, New Zealand
If Guns'n'Roses ever tours Rotorua, New Zealand, they'd sing, “Take me down to the Sulfur City, where the air is smelly and the geysers are pretty."
Rotorua was built atop highly active geothermal vents that constantly belch the rotten-egg scent of sulfur, so much so that the town's nickname is Sulfur City. Just like Seal Island, the stench doesn't staunch the flow of tourists.
Numerous hot springs, geysers and other natural wonders can make a visitor forget that the area smells like an Easter egg that wasn't found until Christmas.
Tourists get a free souvenir as well. The smell sticks to clothes, so even after they leave, the scent of brimstone follows them.
Unfortunately for Rotorua's residents and visitors, eau-de-expired-eggs will never be a chic perfume.
The gas can be more than just an annoyance. Over the years at least 10 deaths have been attributed to the hydrogen sulfide leaking from beneath Rotorua. In September of 1987, newlyweds died during the night in their hotel room. A faulty water trap in the unit's shower let gas into their room. An Austrian actress died in a hotel room in February 2000, and some linked her death to gas exposure.
The gas might not kill a person outright, but long-term exposure may be a health hazard. The New Zealand Herald reported that hospital admissions for asthma and other breathing diseases in six Rotorua districts were five to 10 times the local average between 1991 and 2001.