Searches for Madeleine McCann have resumed in Portugal, 18 years after her disappearance in Praia da Luz. Authorities are focusing on disused buildings and wells in the area, particularly around Lagos. The prime suspect, Christian Brückner, is currently in prison for a separate crime. The search is extensive, covering 21 plots of land, and aims to uncover any evidence related to Madeleine's case, which remains one of the most high-profile missing persons investigations in Europe.