La Palma

Caldera de Taburiente sits in the north-center of the island, a wide bowl cut deep into the mountain’s own construction, and it has been protected as a national park since 1954. Its walls form a cross-section of banded lava, layer stacked on layer, each band a separate chapter of the island’s building. The oldest rock sits low in the walls, laid down over a long stretch of the deep past. Above it comes a distinct shield-building layer, from the era when eruption after eruption piled the mountain higher. And at the top of the stack, forming the rim itself, is the youngest layer of all — lava whose recorded age simply runs forward to the present, with nothing above it yet. Walk any distance into the bowl and you are walking through geologic time laid out in cross-section, the deep past underfoot and the near-present somewhere above your head, at the rim where the caldera meets the sky.

The summit at Roque de los Muchachos sits on the caldera’s rim, at the topmost point of the same stack of lava you can trace in the walls far below. Its clear, dark air has drawn an international observatory to build close by the summit, taking advantage of the same height and isolation that make the view down into the caldera so complete. Stunted pines hold on in the thin, mineral soil near the top — tough trees built for exactly this kind of bare volcanic ground, their thick, plated bark helping them survive fire and cold that would finish off softer species. Standing at this summit puts you at the youngest, highest rung of the island’s ladder, looking down into everything that came before it: the shield-building layer, and beneath that, the oldest basalt of all.

The road up to Roque de los Muchachos is a drive through the island’s own timeline. It climbs from lower ground toward the caldera’s rim, and the rock exposed in the cuts alongside it changes as you climb: older, plainer basalt low on the mountain, younger and rawer-looking lava higher up, closer to the layer whose recorded age reaches all the way to the present. The road threads through pine forest for much of the climb, the same tough trees that colonize bare volcanic ground wherever it’s fresh enough that little else has taken hold, thinning out as the elevation and the air both grow thinner near the top. No single stop along this route tells the whole story on its own; the drive itself is the site, and the changing composition of the roadside rock is the plot, unfolding a little more with every switchback and every few hundred meters of elevation gained, until the road finally runs out at the rim where the youngest rock on the island is exposed to open sky.

Santa Cruz de La Palma, the island’s capital and second-largest city, sits on the east coast along an old lava flow that once ran from a volcano just south of the city down to the water. The mountain-building this note keeps pointing to didn’t stop at the caldera rim — in this direction it ran all the way to the sea, cooled, and became the flat, level ground a city was later raised on. Walking the old town’s streets and harbor today is, in a small way, still walking on the youngest rock the volcano made in this particular direction, now carrying a working port and centuries of building rather than bare stone. It is a useful counterweight to the wilder sites on this trip: a reminder that land being made is not only something that happens in remote, uninhabited country, but under the feet of an entire working city as well.

Puntallana sits on the island’s northeastern flank, at a modest elevation above the sea and only a short distance up the coast from the capital. It’s a useful reminder that the same shield volcano that rises to the caldera rim runs the length of the island’s edge, not just its summit — the ground under this town is built from the same family of lava, just further from the source and further downhill, weathered into gentler slopes than the raw rock near the top. Towns like this one sit on the volcano’s outer skin the way the capital sits on its youngest flow near the coast, and the caldera sits on its exposed interior: three different ages of the same construction, all inhabited or visited in their own way. The pine forest that spreads across these slopes also holds some of the island’s signature resident birds, several species found nowhere else in the world.