As the citadel of Sibiu was for centuries a fortress at the gates of Transylvania, it was surrounded by walls and defense towers, most of which still proudly stand: the Council Tower, built in the 13th century, the Harquebusiers' Tower, the Potters' Tower, the Carpenters' Tower, all built in the 15th century, the Thick Tower, erected at the middle of the 16th century, the Haller Bastion, built in 1552, the circular Gunpowder Tower and the Tanners' Tower.
Tvrđava u Sibinju bila je vekovima brana na ulazu u Transilvaniju. Bila je okružena zidovima i odbrambenim kulama, od kojih većina ponosno stoji i dan danas: Kula saveta, sagrađena u 13. veku; Kula “arkebuza”; Kula grnčara; Kula tesara – sve sagrađene u 15. veku; Debela kula, sagrađena sredinom 16. veka; Halerov bedem, sagrađen 1552; kružna Barutana i Kula štavilaca.