Dunderberg Mountain
... that a 12-mile (19 km)-long railway ride was planned to be built on Dunderberg Mountain in the 19th century, but was never completed?
... that a <span about="#mwt16" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"12"},"2":{"wt":"mi"},"3":{"wt":"km"},"adj":{"wt":"on"}},"i":0}}]}' id="mwBFc" typeof="mw:Transclusion">12-mile (19</span><span about="#mwt16" typeof="mw:Entity"> </span><span about="#mwt16">km)</span>-long railway ride was planned to be built on <b id="mwBFg"><a href="./Dunderberg_Mountain" id="mwBFk" rel="mw:WikiLink" title="Dunderberg Mountain">Dunderberg Mountain</a></b> in the 19th century, but was never completed?