From the Associated Press via ynetnews.com:
Half of a historic Auschwitz-Birkenau barracks
that was on loan to the US has been returned to Poland after two decades and long negotiations, officials said Sunday.
The Nazi barracks was
one of the main items at the US Holocaust Museum in Washington, which
wanted the lease extended. But Poland asked for it back after adopting
new regulations in 2003 that limit the loan of all historical and art
works to a maximum of five years. That led to years of negotiations
between the museums and US and Polish governments that ended in October,
when the Holocaust Museum agreed to return its portion of the barracks.