On the south east corner of the island of Graciosa in the Azores, the Furna do Enxofre lies beneath the Caldeira. I walked and hitch-hiked from the village of Praia (also known as Sao Mateus).
A winding stairway of 183 steps partly cut into a volcanic chimney leads down to a domed volcanic cave where there is a sulphurous lake. It's best to go between 11am and 2pm as sunlight beams through a shaft and casts light in a spectacular way.
It's even wiser to phone ahead as the CO2 levels are closely monitored and the cave closes when levels are dangerous. It's a bit disconcerting to say the least, when you're peering into the boiling mud pool and the alarm sounds!
There is an eeriness and stillness in the subterranean world enhanced by knowing you are 100m below the earth's surface inside a volcano.
A little rowing boat sits at the lake edge, though when I visited, the lake was out of bounds. Bring a torch to explore the darker areas and to admire the numerous stalactites. Finally, bring a packed lunch as the food offered is only a few chocolate bars and drinks from a vending machine. There are a few picnic benches outside to enjoy a well deserved snack and a rest.
If you have the energy, you can walk around the edge of the volcano where there are stunning views into the Caldeira and explore lava tunnels as you continue to hike.
All in all a great work for the thighs and bum!

Ilha Graciosa, Portugal
+351 295 712 124
Google map: bit.ly/rbUFyt

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