Of all the creatures whose species have gone extinct, a rare few were more bizarre than anything humanly imaginable. Here are 7 of the strangest.

Humongous holes can be found scattered across the globe, some geological phenomena and others made by man. Here are the most massive man-made and natural holes to be found on our planet.

Everyone knows Stonehenge, but who knew there is a whole world of other stone circles out there? Here are 13 of the most interesting stone circles in the world.

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

While some crop circles can be explained, others remain a mystery. The crop circles that cannot be proven to be man-made often exhibit peculiar characteristics.

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

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.

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.

Films like Madagascar tell exciting stories of animals escaping from their captors, yet the characters' real-life counterparts still sit behind bars -- except these lucky few.

After looking at meteors in a previous post, now we view comets and their place in our lives.

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.

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

From a Mayan treehouse playground of the rich to the home of descendants of Bounty mutineers, here are 10 mysterious and unusual islands.

Symbiotic pairs, camouflaged critters and color-changing animals are one thing, but what about exploding and raining animals? Oh yes, they exist and much much more.