The Von Trapp family, made famous in the musical The Sound of Music, spent several months during World War II hiding in the Dutch town of Warmond, near Leiden, according to writer Miep Smitsloo.

Smitsloo says she made the discovery while researching for her book, Het Tolhuysch (The Toll House). The Von Trapps fled Austria, after it was annexed by Hitler in 1938, and ended up in America.
Smitsloo said the Von Trapps stayed with a family called Menten, whom they knew through the Salzburg festival.