About: http://webisa.webdatacommons.org/436203831

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	The natural underground hollow passage under the earth, especially one opening to the surface, enough for a person or small group of people to enter.
http://www.w3.org/ns/prov#wasQuotedFrom	nerdygaga.com