People are asking me if it's possible to see Russia from Alaska. Well, the Bering Strait is over 50 miles (80 km) wide. The horizon is about 2.89 miles for a average person standing on the surface of the earth. However if one were stationed on a 100-foot tower, the horizon or farthest distance one could see before the curvature of the earth limits vision at the horizon is mere 12.25 miles. Thus, it is not possible to see Russia proper from Alaska across the Bering Strait. Wikipedia has more about the horizon.