You’ll want to reserve tickets now to explore Crystal Cave, which will once again welcome visitors from May 23 to September 7 ...

Scientists have determined the reddish-brown rock art found in a cave on Indonesia's Sulawesi Island is more than 44,000 ...

The Yarlung Tansgpo / Brahmaputra dam shows we often don’t know how to deal with rivers that cross national borders.

For a truly supersized wilderness experience, few places on Earth can compete with the United States of America. The US is a ...

I visited all the major US national parks and ranked them based on factors like beauty and crowd size. My favorites include ...

Son Doong, the world's largest cave in central Vietnam, ranks among the world's most surreal destinations, according to U.K.

The cave is one of about 275 known caves in Sequoia and neighboring Kings Canyon National Park. The park’s only publicly ...

NOTORIOUS for being the party capital of Europe, Ibiza is not exactly renowned for its calm and relaxed atmosphere. The ...

Hang Son Doong is in Phong Nha-Ke Bang National Park in Vietnam, near the border with Laos and is the world's largest natural ...

One thing you want to be sure to add to your itinerary is visiting the ancient Greek monasteries. Here are the top 10 ...