Chislehurst Caves
...that the Chislehurst Caves of Kent are actually mines that were first worked in 1250?
...that the <b id="mwAY8"><a href="./Chislehurst_Caves" id="mwAZA" rel="mw:WikiLink" title="Chislehurst Caves">Chislehurst Caves</a></b> of <a href="./Kent" id="mwAZE" rel="mw:WikiLink" title="Kent">Kent</a> are actually mines that were first worked in <a href="./1250" id="mwAZI" rel="mw:WikiLink" title="1250">1250</a>?