These structures in the Azores islands are quite perplexing, given their unexpected location in the middle of the Atlantic. Portuguese explorers officially discovered the Azores in the early 1400s when the islands were believed to be uninhabited. However, physicist Dr. Felix Rodrigues has undertaken research that suggests these structures might be far older.

Dr. Rodrigues began his quest for answers a decade ago on Terceira Island, his home. Among the structures he has found, the oldest appear to be dolmens, potentially used by prehistoric cultures for burying their dead. These cylindrical cavities within the rocks indicate intentional human activity. Material within these cavities has been dated to be at least two and a half thousand years old, with ceramic pieces in the area believed to be over 4,000 years old.

By the sea, there are intriguing clues that suggest an earlier arrival than the 15th-century Portuguese. Dr. Rodrigues sees a connection between these two structures, which form a ritualistic complex. This complex includes a ground basin in the middle of the Columbarium, connected to the outside by a duct. Similar basins are found elsewhere on Terceira Island, carved into volcanic rocks and accompanied by a flooded cave.

Not everyone is convinced that these structures are as ancient as Dr. Rodrigues suggests. Some argue that they could be stables from a 16th-century fortress.

Inland, there are also controversial structures known as "relheiras," locally associated with cart tracks. While some questions are easier to answer, the true identity of the civilization responsible for these enigmatic structures remains uncertain.