Innsbruck - here despite it never being on my to-see list

From Aboutmalta.com: "The megalithic temples of the Maltese Islands are justly claimed to be the most impressive monuments of European prehistory. They are remarkable not only because of their originality, complexity and striking massive proportions, but even more so because of the considerable technical skill required in their construction. These temples are complex structures extended and embellished over a long period of time and were until recently dated to the 3rd millennium B.C. " http://www.aboutmalta.com/gozo/ggantija.html

In other words, a bunch of big, cool rocks that are part of one of the oldest surviving temples in the world.

The "Ggantija Temples at Xaghra, Gozo, excavated in 1827 by Col. Otto Bayer, are the most imposing and best preserved of the megalithic structures erected during the Copper Age (c. 3,600-2,500 B.C.) (Aboutmalta.com).