Ancient Aliens Season 2 Episode 1 (Ancient Aliens s02e01) with title “Mysterious Places” aired on Thursday, October 28th 2010 at 10:00 pm via History Network.
Here is summary for Ancient Aliens Season 2 Episode 1 :

The second-season opener examines mysterious places on Earth connected with UFO sightings, including the Bermuda Triangle; Mexico’s Zone of Silence in the Chihuahuan desert; and Peru’s Puerta de Hayu Marca.