Many places within Volcanoes National Park on the Big Island of Hawaii spew sulfer from the very active ground. This spot of vibrant sulfur is one of the most viewed, as it lies in the crater adjacent to the visitor center near the entrance of the park.

Easy to identify as the only colour among monotone volcanic rock, along with the expected smell, areas with open sulfur holes are often accompanied by active steam vents. It's just one of a thousand indicators of general danger underfoot that exist in the various terrains found on the Big Island.

If you're in Hawaii at the right time you may be allowed to walk out to the lava flows on the west coast of the island. At times the lava is quite visible, and sometimes it flows into the ocean in open view.