The Hiroshima Peace Memorial (広島平和記念碑, Hiroshima Heiwa Kinenhi), originally the Hiroshima Prefectural Industrial Promotion Hall, and now commonly called the Genbaku Dome, Atomic Bomb Dome or A-Bomb Dome (原爆ドーム, Genbaku Dōmu), is part of the Hiroshima Peace Memorial Park in Hiroshima, Japan and was designated a UNESCO World Heritage Site in 1996. The ruin of the hall serves as a memorial to the over 140,000 people who were killed in the atomic bombing of Hiroshima at the end of World War II.
Stamp:
World Heritage - Hiroshima buildings and Peace Stamps (from a set of 10) - Issued: 20-03-2003
Many thanks to Linda for this fantastic card!
See here for a Cover from Hiroshima with a different postmark.