About: http://webisa.webdatacommons.org/293743419

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	A fortress or castle will commonly have any of 3 kinds of obstacles (one outside, two inside):
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com