Tourists observe the main crater of the Santiago volcano during a fair at the Masaya National Park April 18, 2015. The national park held the fair to commemorate Earth Day which falls on April 22. ... more 
Tourists observe the main crater of the Santiago volcano during a fair at the Masaya National Park April 18, 2015. The national park held the fair to commemorate Earth Day which falls on April 22. Picture taken April 18, 2015. REUTERS/Oswaldo Rivas less 
1 / 30
Reuters | Photo By OSWALDO RIVAS / REUTERS
Sun, Apr 19, 2015 11:22 AM EDT