Four pre-Inca tombs found in Peru's Lima

Archaeologists in Peru have found four tombs that are more than 1,000 years old in a pyramid-shaped cemetery that now sits in the middle of a residential neighborhood in Lima, experts said.

Solar tech could enable world's first underground park

Visitors from around the world are drawn to New York City's High Line, an elevated park built on defunct railroad tracks transformed into an urban sanctuary of flowers, grasses and trees.

Self-driving cars now need a permit in California

Computer-driven cars have been testing their skills on California roads for more than four years—but until now, the Department of Motor Vehicles wasn't sure just how many were rolling around.

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