1. Method for navigating in the interior of the body using three-dimensionally visualized structures, comprising the following steps: providing at least two two-dimensional images ( 50, 50 ′) of the same anatomical object ( 12 ) from different perspectives and also of information which makes it possible to draw a conclusion about the respective spatial position of an imaging system ( 26 ) relative to the anatomical object ( 12 ); defining a projection ( 76, 76 ′, 78, 78 ′) of a geometrical structure ( 72, 80, 82 ) to be visualized or a part thereof in each two-dimensional image, wherein the geometrical structure ( 72, 80, 82 ) to be visualized is different from the anatomical object ( 12 ); generating a conical surface ( 40, 40 ′) in space for every image ( 50, 50 ′), wherein the spatial positions of cone vertex ( 46, 46 ′) and cone directrix are determined from the respective spatial position of the imaging system ( 26 ) and the shape of the cone directrix is determined from the shape of the projection ( 76, 76 ′, 78, 78 ′) of the geometrical structure ( 72, 80, 82 ) to be visualized; forming a spatial intersection of the individual conical surfaces ( 40, 40 ′) to determine the geometrical structure ( 72, 80, 82 ); and displaying the geometrical structure ( 72, 80, 82 ) determined and/or an intersection ( 74 ) of a plurality of geometrical structures ( 72, 80, 82 ) determined and using the representation for navigation.