RAND Europe conducted a survey of researchers worldwide on their experiences with visiting or relocating to other countries for research-related purposes. The survey covered 2,465 respondents from 109 countries. It was commissioned by the Wellcome Trust on behalf of the international Together Science Can campaign, and supports the campaign's work to celebrate and protect international collaboration in science. Over three quarters of respondents had moved to live in another country for research training or work at some point during their career. More senior researchers tend to travel more frequently. Nearly all respondents stated that research benefits from researchers visiting or moving to other countries. They perceived that international movement had helped in forming collaborations and developing ideas, skills and expertise, but can also present challenges on a personal level. Reported barriers to international movement included access to funding, family responsibilities, lack of information about jobs abroad and visa-related obstacles. Respondents who were nationals of African and Asian countries generally encountered more obstacles to international movement than those from North America and Europe.