After the end of World War II, the Secret Annex was on a list of buildings to be demolished, but a group of people in Amsterdam campaigned and set up the foundation now known as the Anne Frank House. The house preserved Frank’s hiding spot; today it is one of the three most popular museums in Amsterdam. In June 2013, the Anne Frank House lost a lawsuit to the Anne Frank Fonds, after the Fonds sued the House for the return of documents linked to Anne and Otto Frank. Anne’s physical diary and other writings, however, are property of the Dutch state and have been on permanent loan to the House since 2009. In 2015, the Fonds, the copyright holders of Anne’s diary, lost a lawsuit against the House after the House began new scientific research on the texts in 2011.