Underwater Pyramid of the Azores
D. João de Castro Bank, between Terceira and São Miguel, Azores, Portugal
Underwater structure / Alleged pyramid. Height: 60 m. Date: No dating; volcanic origin not ruled out.
None; the Portuguese Navy considers it most likely not artificial. Reported in 2013 by the sailor Diocleciano Silva, with bathymetric surveys. The Navy already knew of it and considers it most likely not artificial; the University of the Azores is skeptical.