Incan ruins of Machu Picchu outside Cuzco, Peru -- Sean Caffrey/Lonely Planet Publications Ltd.

Incan ruins of Machu Picchu outside Cuzco, Peru -- Sean Caffrey/Lonely Planet Publications Ltd.

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• Exactly 100 years ago today, an American scholar hiked up this ridge and discovered these ruins.""In some circles, he\s considered the real “Indiana Jones”
• The Incas built these complex stone structures centuries ago amid some of the most forbidding mountain slopes around.""After all these years, no one really knows why
• This energy-efficient home in the clouds features mountain views, an open floor plan, skylights, stone countertops, terraces, and loads of old-world charm…""The plumbing could use some updating
• Before visiting this sacred perch, you\ll want to start nearby in this former Incan capital, whose name means “navel of the world.”""Spanish conquistadors may have tried to topple the city years ago, but it\s now protected as a UNESCO World Heritage Site