Cave of Swallows
...that the Cave of Swallows is so large and wide that it is possible to navigate a hot air balloon through the cave with ease?
...that the <b id="mwCs4"><a href="./Cave_of_Swallows" id="mwCs8" rel="mw:WikiLink" title="Cave of Swallows">Cave of Swallows</a></b> is so large and wide that it is possible to navigate a hot air balloon through the cave with ease?