Sentence:  An old shipwreck , a high dam , an old covered bridge , a place to find <WSD>agates</WSD> or other semi-precious stones or a place to pan gold , etcetera may be of interest . 
Meaning of the word marked with <WSD> tags:  an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles