Image credits.

Archive photographs, resized and compressed. Video thumbnails identify and link to their original publications.

Andorra la Vella

Diego Delso, delso.photo · 2013-12-30.
Wikimedia Commons · CC BY-SA 3.0.

Casa de la Vall

Diego Delso, delso.photo · 2013-12-30.
Wikimedia Commons · CC BY-SA 3.0.

CERN

Florian Hirzinger · 2009-02-25.
Wikimedia Commons · CC BY-SA 3.0.