The San Antonio volcano is on the island of La Palma, where I was a few years ago, on a very special occasion. You could say that the island shows a great number of different natural spaces, from the coast to the elevated areas covered in woods and laurel or pine forests, to the uppermost mountainous areas with a continental climate.
For the cleanliness and clarity of the sky, it was chosen as the best place for a astrophysics complex, which lies on top of the Roque de los Muchachos (one of the viewpoints in Caldera de Taburiente).
Numerous volcanic mounds covered with old lava reminds us of the volcanic origin of the island, which also presents a charming landscape.
It’s a surprising contrast between visiting the San Antonio volcano in Fuencaliente, which you can enter for the price of just a few Euros.
The island of El Hierro is the youngest of the archipelago and, as such, it is more likely to suffers seismic and volcanic phenomena, etc.
The municipalities of Frontera and El Pinar are more prone to suffering this kind of phenomena. There are approximately 500 craters in the island, making it the one with more volcano density in the entire Canary Islands. Since it is the last island that emerged in the archipelago, it is still in a primary phase, so the risk of volcanism is greater.
The places where you can observe volcanic cones are near the lighthouse of Punta Orchilla, in the municipality of El Pinar, or in Dehesa, municipality of Frontera. It is really a beautiful view, to be able to be in front of a volcanic cone.
I recommend the visit If you are in the island of El Hierro.