English: Looking south at the Pan Am Flight 103 Memorial at Section 1 of Arlington National Cemetery in Arlington, Virginia, in the United States. Also known as the "Lockerbie Cairn," the memorial is located in a portion of Section 1 just in front of the cemetery's Old Administration Building.

Pan Am Flight 103 was destroyed in flight by a bomb on December 21, 1988, over Lockerbie, Scotland. Libya later admitted that officials of its state security agency planted the bomb in retaliation for various U.S. air strikes against Libya (primarily the 1983 attacks on Tripoli). Eleven of the 270 lives lost were people on the ground. Of the 189 Americans who lost their lives in the attack, 15 were active duty military personnel and 10 were retired military personnel. Also lost were 35 students of Syracuse University who had been studying through the University's Division of International Programs Abroad.

President Bill Clinton signed legislation in November 1993 permitting the placement of a memorial to the dead at Arlington National Cemetery. The memorial was financed with private donations, and is a gift of the people of Scotland to the people of the United States. The monument is made of 270 blocks of red sandstone quarried from Corsehill Quarry in Annan, Scotland, about eight miles southeast of Lockerbie. The stones from a cairn, a traditional Scottish monument. Carins take many forms. In this case, the stones are mortared together into a tower that slopes slightly inward as it rises. The cairn rests on six dark grey granite stones shaped like wedges of pie. At its base, the cairn is 7 feet across. It is 10 feet, 6 inches high. Around the base of the cairn, attached to the granite base, are six bronze plaques listing the names of the dead. On the north face of the cairn midway up the face is a bronze dedicatory plaque. The monument was dedicated by President Clinton on November 3, 1995.