Portals into the Past Walk the timeless streets and byways of ancient cities on three continents

• Mesa Verde
• Pompeii
• Tikal
• Petra

Feats of Engineering The world's surviving architectural wonders hewed from stone and mortar beckon as ever

• Pyramids of Giza
• Taj Mahal
• Easter Island
• The Great Wall

A Matter of Timing Choosing the right year, month or even moment can make all the difference

• Aurora Borealis
• Serengeti
• Iguazu Falls
• Machu Picchu

Triumphs of Vision Come face to face with history's finest works of art and design

• The Louvre
• Zen Garden of Kyoto
• Uffizi Gallery
• Fallingwater

Scale New Heights Don't just see nature's most spectacular sites—experience them

• Yangtze River
• Antarctica
• Mount Kilimanjaro
• Grand Canyon

In the Presence of Gods Encounter temples so magnificent then could only have been built by divine inspiration

• Pagan
• Parthenon
• Angkor Wat
• Ephesus

Here Today, Gone Tomorrow? Visit these deteriorating or threatened destinations before they disappear

• Venice
• Amazon Rain Forest
• Great Barrier Reef
• Galápagos Islands

"We are all of us resigned to death: it's life we aren't resigned to," novelist Graham Greene once wrote.