“This flame here is one of the more famous eternal flames due to it’s location inside of a waterfall. They occur because of cracks in the earth that leak a combination of natural gases.

At over 130 feet high, it's the tallest indoor waterfall in the world ... Part luxury mall and part indoor rainforest, here's a look inside the complex making layovers more fun.

Blood Falls in Antarctica flows unpredictably with iron-rich, salty water. Microbes inside survive without sunlight.

Waterfalls are another recurring theme ... along with its railway line. Deep inside, there are several small chambers replete with mineral veins and, gypsum crystals and stalactite formations.

the gorgeous Havasu Falls is located on the Havasupai Indian Reservation inside the Grand Canyon (but is not part of Grand Canyon National Park). In order to hike to this waterfall, you'll need to ...

Waterfalls are another recurring theme ... along with its railway line. Deep inside, there are several small chambers replete with mineral veins and, gypsum crystals and stalactite formations. On the ...