The 8 Most Mysterious Places in the World - Slideshow

4. Machu Picchu, Peru

Machu Picchu -- sequestered in a flat ridge of the Andes Mountains -- was so well-hidden that Spanish conquistadors overlooked it. Undisturbed for hundreds of years, it's now a major tourist destination.

Read More:

• The 8 Most Mysterious Places in the World

You might also be interested in...

• Slideshow: Best Places for a Bachelor or Bachelorette Bash
• Slideshow: Best Places to Watch the Sunset
• Slideshow: World's Prettiest Castles