France, Indre-et-Loire, Chateau de Chinon, Chinon Fortress, La Tour de l'Horologe viewed from Rue Haute Saint Maurice in the historic old town of Chinon.

Portugal, Lisbon, Belem Tower, 16th-century fortification that served as a point of embarkation and disembarkation for Portuguese explorers and as a ceremonial gateway to Lisbon, the tower symbolizes...

Portugal, Lisbon, Belem Tower, 16th-century fortification that served as a point of embarkation and disembarkation for Portuguese explorers and as a ceremonial gateway to Lisbon, the tower symbolizes...

Portugal, Lisbon, Belem Tower, 16th-century fortification that served as a point of embarkation and disembarkation for Portuguese explorers and as a ceremonial gateway to Lisbon, the tower symbolizes...

Portugal, Lisbon, Belem Tower, 16th-century fortification that served as a point of embarkation and disembarkation for Portuguese explorers and as a ceremonial gateway to Lisbon, the tower symbolizes...

Spain, Castile and Leon, Avila, Avila Cathedral, statue of Santa Teresa de Avila.

Spain, Castile and Leon, Avila, Avila Cathedral tower viewed from the walkway along the interior perimeter of the city walls that were built from 1090 onwards and are among the best-preserved and most...

Spain, Castile and Leon, Avila, Puerta del Alcazar or Gate of the Fortress is a monumental gate with very strong turrets flanking the entrance, it is part of the city walls that were built from 1090 o...

Spain, Castile and Leon, Avila, Puerta del Alcazar or Gate of the Fortress is a monumental gate with very strong turrets flanking the entrance, it is part of the city walls that were built from 1090 o...

Spain, Castile and Leon, Avila, City walls with the circular Avila Cathedral built into the walls that were built from 1090 onwards and are among the best-preserved and most complete in Europe.

Republic of Ireland, County Clare, Bunratty Castle, a large 15th-century tower house built by the MacNamara family around 1425.

Ireland, County Kerry, Killarney, Ross Castle, 15th-century tower house and keep on the edge of Lough Leane in Killarney National Park, the ancestral home of the Clan O'Donoghue.