Solahütte (AKA Solehütte, Soletal, SS-Hütte Soletal, SS Hütte Porabka) was a little-known resort for the Nazi German guards, administrators, and auxiliary personnel of the Auschwitz/Birkenau/Buna facilities. Because Auschwitz detainees overseen by Franz Hössler constructed the rustic getaway facility and a crew of detainees did ongoing grounds-keeping and cleanup work, Solahütte can be considered a tiny subcamp of Auschwitz. Postcards of the era sent by German staff sometimes bore the resort hamlet's mysterious pre-printed return address "SS Hütte Soletal" but otherwise the place remained largely unknown until 2007 when the Höcker Album of vintage Auschwitz photographs was donated to the United States Holocaust Memorial Museum which then released images online for study.