This Arizona Cave Turns Brilliant Green Each Day—And It’s Just an Hour From Las Vegas #Travel Only accessible by water, Emerald Cave is a stunning gem along the Colorado River.

Only accessible by water, Emerald Cave is a stunning gem along the Colorado River.<div class="media_block"><a href="https://www.travelandleisure.com/thmb/ENAXbPl1YV74jXTwwNJfq4rU_oI=/filters:no_upscale():max_bytes(150000):strip_icc():format(jpeg)/TAL-header-emerald-cove-arizona-02-EMERALDCOVE1025-6e27237d620b47f089d4a164dc593ac5.jpg"><img src="https://www.travelandleisure.com/thmb/ENAXbPl1YV74jXTwwNJfq4rU_oI=/filters:no_upscale():max_bytes(150000):strip_icc():format(jpeg)/TAL-header-emerald-cove-arizona-02-EMERALDCOVE1025-6e27237d620b47f089d4a164dc593ac5.jpg" class="media_thumbnail"></a></div>