Ten stone circles of Britain: Stonehenge, Avebury, Castlerigg, Swinside, Long Meg and Her Daughters, Calanais, Ring of Brodgar, Stones of Stenness, Boscawen-Un and The Hurlers. Exact documentary photographs show each monument in its landscape. This selection is not a ranking by age or size. Surviving stones are not presented as complete original circles. Stonehenge: garethwiscombe; CC BY 2.0; https://creativecommons.org/licenses/by/2.0/; https://commons.wikimedia.org/wiki/File:Stonehenge2007_07_30.jpg; resized and fitted to portrait frame; derived image retains the source license. Avebury: PsychedeliaSmithandTheGlitch; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Avebury_Stone_Circle_on_a_sunny_day.jpg; resized and fitted to portrait frame; derived image retains the source license. Castlerigg: Photograph by Mike Peel ( www.mikepeel.net ).; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Castlerigg_Stone_Circle_2015_1.jpg; resized and fitted to portrait frame; derived image retains the source license. Swinside: Michal Gregor; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Swinside_Stone_Circle_01.jpg; resized and fitted to portrait frame; derived image retains the source license. Long Meg and Her Daughters: Simon Ledingham; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0/; https://commons.wikimedia.org/wiki/File:LongMegAndHerDaughters%28SimonLedingham%29May2005.jpg; resized and fitted to portrait frame; derived image retains the source license. Calanais / Callanish: PaulT (Gunther Tschuch); CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Callanish_I_01.jpg; resized and fitted to portrait frame; derived image retains the source license. Ring of Brodgar: Oliver Dixon; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0/; https://commons.wikimedia.org/wiki/File:Ring_of_Brodgar_%282015%29.jpg; resized and fitted to portrait frame; derived image retains the source license. Stones of Stenness: August Schwerdfeger; CC BY 4.0; https://creativecommons.org/licenses/by/4.0/; https://commons.wikimedia.org/wiki/File:Standing_Stones_of_Stenness_2017-05-23_-_1.jpg; resized and fitted to portrait frame; derived image retains the source license. Boscawen-Un: Waterborough; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:01_Boscawen-un.JPG; resized and fitted to portrait frame; derived image retains the source license. The Hurlers: Olaf Tausch; CC BY 3.0; https://creativecommons.org/licenses/by/3.0/; https://commons.wikimedia.org/wiki/File:Hurlers_01.jpg; resized and fitted to portrait frame; derived image retains the source license.