Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Octagonal bell tower, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy

Octagonal bell tower, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy

Octagonal bell tower, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy

Bourtzi octagonal tower of Methoni Castle and the stone bridge in stormy sea, Methoni, Messenia, Peloponnese, Greece, Europe

Octagonal bell tower, Sanctuary of St. Michael the Archangel, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy

Octagonal Krishna Temple built by Pratapa Malla in memory of two of his favourite queens, Durbar Square, UNESCO World Heritage Site, Patan, Bagmati, Nepal, Asia

Cathedral of San Salvatore, Aix-en-Provence, Bouches du Rhone, Provence-Alpes-Cote d'Azur, France

The 21m octagonal tower of the Thien Mu Pagoda by the Perfume River near Hue, Vietnam, Indochina, Southeast Asia, Asia

Buckyballs Detected in SMC