Barely a year after a similar eruption in Iceland forced the biggest closure of European airspace since World War II, the eruption of the Grimsvotn volcano, under the Vatnajokull glacier in southeast Iceland on May 21, 2011 has caused hundreds of travel delays. The ash cloud forced U.S. President Barack Obama to shorten a visit to Ireland and has raised some fears of a repeat of last year's huge travel disruptions across Europe when emissions from Eyjafjalljokull stranded millions of passengers. Although this disruption is said to be stronger than that of Eyiafjalljokull, it is not expected to have the same impact. Take a look back at two Big Picture posts from the 2010 Icelandic volcano eruption: Iceland's disruptive volcano and More from Eyiafjallajokull . -- Paula Nelson ( 24 photos total