Photos and videos of powerful volcanic eruptions from around the world.

Rainforest treetop walks are not for the faint of heart or those fearful of heights, but incredibly amazing adventures for those who dare to take the walk.

Spices were one of the main products in early international trade. Many of today's popular pungent plant-based flavors are the same as their equally desirable fore-bearers.

Though sandy, palm-framed beaches dominate the calendar industry and the imaginations of tourists, the world's rocky, rugged coastlines are no less stunning

Tucked away in the Georgetown district of Washington, D.C. is a 16-acre treasure, rich with history and botanical surprises, Dumbarton Oaks gardens.

Rivers are still important transportation routes in places where roads and rails cannot go. They are also a source of energy and drinking water.

Several large summer music festivals are pushing the envelope in terms of environmental and sustainability initiatives.

Desert topography seems especially alien. It is no surprise that some of the world's most unusual and spectacular flowers and trees are found in the desert.

For these animals, negotiating rocky terrain and finding food in such a scarce environment is second nature.

There are species of undomesticated animals that retain some or all of their wildness while performing tasks that benefit humans.

There are many unlikely animals that are able to endure or adapt to harsh environments. Here are some of the greatest of these survivor species.

Though the islands on this list are not as well known as the world's biggest and most scenic isles, they have plenty of characteristics that make them among the world's most unique islands.

These natural places feel like they belong far away from city life, yet they are surprisingly near some of the world's greatest cities.

A magical sunset can take your breath away. Some photographers are able to capture and even enhance the beauty of a sunset through HDR photography.

Before the days of jetted tubs, spas, and heated pools, the only real place to soak in hot water not in your bath tub was to visit a geothermal hot spring.