From sea the 3-5 m. high defence wall looks massive and impressive... but what you can't see is the tiny rift valley leading into a secret tunnel that makes it possible for the defenders to attack from a different angle
The Ertholmene islands are ringed by more than 2 km. of strong, massive granite defence walls, bastions and platforms. Build carefully, and skilfully hundreds of years ago, not even usen mortar - Just stone on stone, many of the walls being several meters in hight
The legendary "Christiansoe herrings" where for many years made in a small house, just under the fierce looking round naval fortress defence tower " small tower" Still remember the days when...
In the spring and autumn Ertholmene is a welcoming resting place for many migrating birds and on cliffs and in shelter of the towers and among the rocks, many small birds rest, before continuing their journeys out over the water