The Week’s guide to what’s worth watching

The best programs on TV this week

NOVA: Ghosts of Machu Picchu

Peru’s Machu Picchu has been the most famous ruin in the Western hemisphere since its discovery in 1911, yet many mysteries still surround it, including how (and why) the Incas hauled massive blocks to the face of a steep mountain. NOVA joins archaeologists as they probe previously untouched areas of “the Lost City of the Incas” and even unearth some of its buried builders. Tuesday, Feb. 2, at 8 p.m., PBS; check local listings

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