ARMERO, Colombia — Touring the ruins of this once-bustling farm town, veterinarian Fernando Angarita points to the overgrown lots where the bakery, the hospital and the Presbyterian church once stood.

A volcanic eruption could destroy the Icelandic town of Grindavik or lead to extensive ash clouds, experts have warned. The country has been shaken by more than 800 small earthquakes today alone, ...

It’s also an artsy community with historic buildings, like the Kilauea Lodge and Restaurant, originally built in 1938 as a YMCA camp. Volcano Village, the town’s busiest center, is home to charming ...