Mars Tower - "The Tower" seems to show a tall tower or stack with a white tip casting a long shadow. If it is indeed a tower of some kind, it stands at an incredible 6.3 kilometers high - 12 times taller than the largest skyscraper on Earth.
Serpent Mound - Ohio, USA The figure of a giant snake, apparently uncoiling itself, was excavated in the late 19th century. The massive serpent is nearly a quarter-mile long. Recent carbon-dating research suggests the Fort Ancient culture built the monument roughly 900 years ago. The serpent’s body is made of raised berms of grassy earth that weave across a plateau. On the summer solstice, the setting sun aligns with the snake’s head.