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Lassen Volcanic NP, California
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Located right off the main park road, visitors can easily view the bubbling mud pots and fumaroles without a strenuous hike.
The area emits a strong sulfur odor due to hydrogen sulfide gas released from the geothermal activity.
In the late 19th and early 20th centuries, the area was mined for sulfur, which was used in various industrial processes.
The geothermal features are a result of the park's location within the Cascade Range, a region known for its volcanic activity.
Unlike some other park areas, Sulphur Works remains accessible in winter, offering a unique view of steaming vents against a snowy backdrop.
