Fagradalsfjall in Iceland in 2021 was more or less a self-guided tourist attraction. I went twice a few weeks apart. Depending on the state of the flow there

Fagradalsfjall in Iceland in 2021 was more or less a self-guided tourist attraction. I went twice a few weeks apart. Depending on the state of the flow there were different viewpoints and paths. There were a few search and rescue teams around during daytime hours, and some recommended paths, but I wouldn't call it a controlled area in any way. In general the lava flow was more than slow enough that you wouldn't be in any danger from it unless you did something incredibly stupid (and some people did, although I don't believe anyone died). In some of the valleys farther from the main caldera the lava was barely moving - if you were so inclined you could go and poke it with a stick. People brought hotdogs as a joke to roast over the lava. I imagine you can find pictures online easily enough, as hundreds of people were going up there every day.