Italy's Mount Etna, Europe's tallest and most active volcano, spews lava as it erupts on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





A tourist stands in front of Italy's Mount Etna as it spews lava during an eruption on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on February 28, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Volcano guides stand in front of Italy's Mount Etna as it spews lava during an eruption on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Volcano guide stands in front of lava pouring from Italy's Mount Etna during an eruption on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on February 28, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna, Europe's tallest and most active volcano, spews lava as it erupts on the southern island of Sicily, Italy on February 28, 2017. (Photo by Antonio Parrinello/Reuters)





Pouring lava is seen during Italy's Mount Etna eruption on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on February 28, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Pouring lava in seen during Italy's Mount Etna eruption on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on February 28, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on March 1, 2017. (Photo by Antonio Parrinello/Reuters)





Italy's Mount Etna spews lava as it erupts on the southern island of Sicily, Italy on February 28, 2017. (Photo by Antonio Parrinello/Reuters)