Map of Europe
Country outlines from Natural Earth, which is in the public domain.
Video thumbnails
- Investigation 001 · Valencia, Spain. "Russafa Street (48991683266)" by Derek Rankine, CC BY 2.0.
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Investigations
The photos, film clips and maps in each video are credited on that video's page, under "Photo, footage and map credits".
Sources
The sources of every figure are listed on each investigation's page.