=== Monumenter og fortidsminder ===
Med sine jordbesiddelser ejer hertugdømmet over 270 monumenter i form af bl.a. fæstninger og fortidsminder, der er fredet eller under lignende beskyttelse. Ud af disse bliver 16 drevet af [[English Heritage]]:<ref name="AncientMonuments">{{cite web|url=https://duchyofcornwall.org/ancient-monuments.html | title=Ancient Monuments | publisher= Duchy of Cornwall |access-date=2021-12-16}}</ref>
* [[Scillyøerne]]
** [[St. Mary's (Scillyøerne)|St. Mary's]]
*** [[Halangy Down]]: resterne af en landsby fra [[jernalderen]] og [[Bant's Carn]]s gravkammer ved siden af<ref>{{citation |url=https://www.english-heritage.org.uk/visit/places/bants-carn-burial-chamber-and-halangy-down-ancient-village/ | title=BANT'S CARN BURIAL CHAMBER AND HALANGY DOWN ANCIENT VILLAGE |publisher=[[English Heritage]] |access-date=2021-12-16}}</ref>
*** [[Innisidgen]]: to gravkamre fra [[bronzealderen]]<ref>{{citation |url=https://www.english-heritage.org.uk/visit/places/innisidgen-lower-and-upper-burial-chambers/| title=INNISIDGEN LOWER AND UPPER BURIAL CHAMBERS |publisher=[[English Heritage]] |access-date=2021-12-16}}</ref>
*** [[Porth Hellick]]: grav fra bronzealderen<ref>{{citation |url=https://www.english-heritage.org.uk/visit/places/porth-hellick-down-burial-chamber/ | title=PORTH HELLICK DOWN BURIAL CHAMBER |publisher=[[English Heritage]] |access-date=2021-12-16}}</ref>
*** Garrison Walls: mure der omkranser den vestlige del af [[Hugh Town]]. Den blev påbegyndt omkring 1588, og blev udbygget ca 1715-1746 som en del af øens forsvarsværker<ref>{{citation |url=https://www.english-heritage.org.uk/visit/places/garrison-walls/ | title= GARRISON WALLS |publisher=[[English Heritage]] |access-date=2021-12-16}}</ref>
*** [[Harry’s Walls]]: en ufuldendt forsvarsværk bygget i 1552-1553 over havnen i Hugh Town, der ligger i bugten St Mary's Pool.<ref>{{citation |url= https://www.english-heritage.org.uk/visit/places/harrys-walls/ | title= HARRY'S WALLS |publisher=[[English Heritage]] |access-date=2021-12-16}}</ref>
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