Dive deep into the past in this prehistoric underground spring
December 2, 2016, 7:11 a.m. by Sidney Stevens
Devil’s Den Spring in Florida is a premier diving spot hidden inside a sunken cavern.
Africa's tallest tree discovered towering on continent's highest mountain
November 27, 2016, 3:58 p.m. by Bryan Nelson
A giant has been hiding for decades within a remote Mount Kilimanjaro valley.
After 25 years as a trash dump, San Cristobal Canyon bounces back
October 27, 2016, 7:37 a.m. by Catie Leary
Following years of misuse, gorgeous canyon gains new life as one of Puerto Rico's most important ecological attractions.
9 best train rides for exploring the national parks
October 26, 2016, 5:05 p.m. by Josh Lew
See the national parks in a whole new light with these train trips.