Turrialba Volcano,  30 miles east of Costa Rica's capital San Jose, has been increasingly active in recent years.  Last week, the volcano saw its strongest eruption in decades, sending ash nearly two miles in the air. Volcanologists captured spectacular video of the eruption, taken by an infrared camera, that shows lava shooting from the volcano's mouth. 

“It was a single explosion but a really strong one. This means that there was high pressure inside the volcano,” Javier Pacheco, a government volcanologist, told the Tico Times.

Nearly 11,000 feet, the volcano was a destination for hikers until 2014, when the country closed it off to visitors, due to increased volcanic activity. It's the second highest volcano in Costa Rica, behind Irazú, an 11,260-foot volcano which last blew its top in 1994.