Not all cities have their roots in Antiquity; here are 10 of the world's most gorgeous ancient cities.

pet birds, farm animals, and even aquarium fish have been able to thrive in the wild in certain situations. Here are some examples of domestic species that have unexpectedly made a life for themselves outside the cage.

Through the magic of HDR photography or photo-manipulation techniques, mountain photographs become highly detailed and surreal.

The elements of one of the world's harshest climates can wreak havoc on anything man-made, even while providing the perfect climate for it to be preserved.

A look at 15 of the world's largest organisms, from whales to bears and elephants; even trees are included.

A look at some of nature's most intelligent, social, and organized animals - ones that might seem more human than human in some ways.

Some historic structures, like Angkor Wat in Cambodia or the pyramids in Egypt, draw hundreds of thousands of tourists. Others have been reclaimed by nature.

We're reminded of the inherent beauty of celestial objects large or small, and that we may not always have the chance to view them as we do now.

New technology and new trends in street art mean that spray paint is not the only tool in the artists palette.

Landfills don't have to remain steaming heaps of smelly rubbish. Take these ten former trash heaps that are now characterized by abundant green and diverse wildlife.

A look at stunning temples and monuments built into massive, natural caves.

A look at ten of the world's most beautiful caves.

Renewable energy power plants are usually upgraded before they fall into disrepair. Yet sometimes relics of a renewable past are left scattered across the landscape.

Fascinating man-made islands and floating communities including a former fort fit for a Bond villain and a picturesque Pacific garbage dump.

These animals, whether they were invited, invading, or simply curious, have found their way, unexpectedly, into urban areas.