Buildings and structures completed in 1642

The Round Tower () is a 17th-century tower in Copenhagen, Denmark, one of the many architectural projects of Christian IV. Built as an astronomical observatory, it is noted for its equestrian staircase, a 7.5-turn helical corridor leading to the platform at the top (34.8 meters above ground), and its views over Copenhagen.

church building in Stockholm, Sweden

canal in France

hospital in Paris, France

former fortified colonial trade-post in Sekondi, Ghana

fort

Schanzengraben is a moat and a section of the northwestern extension of the Seeuferanlage promenades that were built between 1881 and 1887 in Zurich, Switzerland. Schanzengraben is, among the adjoint Katz bastion at the Old Botanical Garden and the so-called Bauschänzli bulwark, one of the last remains of the Baroque fortifications of Zürich. The area of the moat is also an inner-city recreation area and a public park.