They've been around for thousands of years, but little is definitively known about Peru's mysterious Nazca Lines, in which scientists recently discovered more than 100 new designs. Here's what ...

But they are long. Paul Williams/FlickrThe Condor, one of the 70 plant and animal geoglyphs that make up Peru’s Nazca Lines.

As a plane soars over the high desert of southern Peru, the dull pale sameness of the rocks and sand organize and change form. Distinct white lines gradually evolve from tan and rust-red.