The Mostar Bridge is in Bosnia, not Croatia, but I don't have a folder for that yet. When it was built, a few hundred years ago, the Sultan told the builder that if the bridge did not stay up, he would be killed. All he had for mortar was goats hair and eggs. The builder went into exile after the bridge was completed. This bridge witstood many centuries and wars but was finally blown up by Serbian troops during the war in the 1990s. A replica has since been built.