Mars Attracts

JASON HAWKES/CORBIS

ROSWELL: As every UFO enthusiast knows, an alien spacecraft putatively crashed in the desert near this New Mexico town in 1947 — and the U.S. military tried to cover it up. At the Roswell International UFO Museum, visitors can examine hundreds of autopsy drawings, sworn affidavits and newspaper reports from the time of the crash. And pick up a tasty Alien Cookie Kit in the gift shop for $7.95.

AVEBURY: For two decades, the fields surrounding this English village have become a hot spot for crop circles (pictured)...

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