IEDs have been a huge challenge for them. Some are massive, their designs often changing in ways that continue to surprise the Canadian engineers. The IED has come to symbolize this war in the way the stinger missile symbolized the mujahideen's fight against the Russians.
rare access to the off-limits Queen's Palace - a former seat of Afghanistan's royal family - also known as Tajbeg. He says the building and its turbulent past represents the sad history of Afghanistan.