The Flickr Befästning Image Generatr

Suomenlinna (Swedish: Sveaborg) is a sea fortress, which was built gradually from 1748 onwards by Sweden on six islands located at the entrance of Helsinki's harbour in Finland. The fortress consists of 200 buildings and 6 km of defensive walls. The work was supervised by the Swedish Admiral and Field Marshal Augustin Ehrensvärd (1710-1772).
en.wikipedia.org/wiki/Augustin_Ehrensv%C3%A4rd

The fortress is an especially interesting example of European military architecture of the time.
The fortress has served to defend three different sovereign states over the years: the Kingdom of Sweden, the Russian Empire and most recently the Republic of Finland.
The fortress is an Unesco World Heritage: "Fortress of Suomenlinna", dossier 583.
whc.unesco.org/en/list

The capital of Malta seen from the Upper Barrakka Gardens - with the late 17th century Fort Ricasoli to the right.

ⓒRebecca Bugge, All Rights Reserved
Do not use without permission.

View over the Great Harbour of Malta, from Floriana (a suburb of the capital Valletta) towards Senglea (on the peninsula in the middle of the shot) and Birgu (on the peninsula to the left).

ⓒRebecca Bugge, All Rights Reserved
Do not use without permission.

Built between 1870-1877

sv.wikipedia.org/wiki/Oskar-Fredriksborg

View over the Great Harbour of Malta, from Floriana (a suburb of the capital Valletta) towards Senglea (on the peninsula in the middle of the shot) and Birgu (on the peninsula to the left).

ⓒRebecca Bugge, All Rights Reserved
Do not use without permission.

The water is a part of the Kattegat sea.
Varberg Fortress was built in 1287-1300. Today it serves as a museum.
en.m.wikipedia.org/wiki/Varberg_Fortress

Part of the city wall.
The historic city of Verona was founded in the 1st century B.C. It particularly flourished in the 13th and 14th centuries and as part of the Republic of Venice from the 15th to 18th centuries. Verona has preserved a remarkable number of monuments from antiquity, the medieval and Renaissance periods.
The core of the city consists of the Roman town containing one of the richest collections of Roman remains in northern Italy. Surviving remains of this era include the city gate, the Ponte Pietra, the Roman theatre, and the Amphitheatre Arena.
Verona’s surviving architecture and urban structure reflects the evolution of this fortified town over its 2,000 year history.
Unesco World Heritage: "City of Verona", dossier 797rev.
whc.unesco.org/en/list/

The tragedy "Romeo and Juliet", written by William Shakespeare (1564-1616), is set in Verona.

(Danish: Aalborghus Slot) The castle was built by King Christian III from 1539 to around 1555, initially as a fortification with ramparts and a moat.
en.m.wikipedia.org/wiki/Aalborghus

(Danish: Aalborghus Slot) The south-facing wing, created between 1808 and 1809. The castle was built by King Christian III from 1539 to around 1555, initially as a fortification with ramparts and a moat.
en.m.wikipedia.org/wiki/Aalborghus

(Danish: Aalborghus Slot) The building to the right is all that remains today of the original castle. It was built by King Christian III from 1539 to around 1555, initially as a fortification with ramparts and a moat.
The wing to the left was built in 1633.
en.m.wikipedia.org/wiki/Aalborghus

(Danish: Krudttårnet) The tower was built in 1687 as a gunpowder magazine and fortification. It secured the northernmost useful anchorage on the eastern coast of Jutland.
en.m.wikipedia.org/wiki/Krudttårnet

New Älvsborg is a sea fort on a small island in the entrance to the Port of Gothenburg. Construction began in 1653, and the fortress remained in service until 1869. It protected what was at the time of its construction Sweden's only access to the North Sea and the Atlantic Ocean. If you visit the fort, you can see a cannonball stuck in the wall of the tower.
en.m.wikipedia.org/wiki/New_Älvsborg

(Swedish: Skansen Lejonet) Built 1687-92. The fortress and its twin, Skansen Kronan, were built to protect the city of Gothenburg against possible Danish attack.
en.m.wikipedia.org/wiki/Skansen_Lejonet

(Swedish: Skansen Lejonet) Built 1687-92. The fortress and its twin, Skansen Kronan, were built to protect the city of Gothenburg against possible Danish attack.
en.m.wikipedia.org/wiki/Skansen_Lejonet

(Swedish: Skansen Lejonet) Built 1687-92. The lion on the roof is wearing a gilded crown, brandishing a sword and bearing a shield. The fortress and its twin, Skansen Kronan, were built to protect the city of Gothenburg against possible Danish attack.
en.m.wikipedia.org/wiki/Skansen_Lejonet

Kärnan (the tower on the top) is a medieval tower in Helsingborg city. It is the only part remaining of a larger Danish fortress which, along with the fortress Kronborg on the opposite bank of the Øresund, controlled the entranceway between the Kattegat and the Øresund and further south the Baltic Sea.
Dendrochronological dating has shown that the tower was built in the 1310s. It was surrendered to Sweden along with the rest of Skåneland as part of the Treaty of Roskilde in 1658. King Charles XI of Sweden ordered most of the fortress demolished fearing that it was too exposed to a sneak attack from Denmark. The only thing that was saved for posterity was the old medieval tower core.
The tower became slowly a ruin and was restored during 1893–94. The stairs and the terraces up to the tower were built in 1903.
en.m.wikipedia.org/wiki/Kärnan

Kärnan (the tower on the top) is a medieval tower in Helsingborg city. It is the only part remaining of a larger Danish fortress which, along with the fortress Kronborg on the opposite bank of the Øresund, controlled the entranceway between the Kattegat and the Øresund and further south the Baltic Sea.
Dendrochronological dating has shown that the tower was built in the 1310s. It was surrendered to Sweden along with the rest of Skåneland as part of the Treaty of Roskilde in 1658. King Charles XI of Sweden ordered most of the fortress demolished fearing that it was too exposed to a sneak attack from Denmark. The only thing that was saved for posterity was the old medieval tower core.
The tower became slowly a ruin and was restored during 1893–94. The stairs and the terraces up to the tower were built in 1903.
en.m.wikipedia.org/wiki/Kärnan

Kärnan (the tower on the top) is a medieval tower in Helsingborg city. It is the only part remaining of a larger Danish fortress which, along with the fortress Kronborg on the opposite bank of the Øresund, controlled the entranceway between the Kattegat and the Øresund and further south the Baltic Sea.
Dendrochronological dating has shown that the tower was built in the 1310s. It was surrendered to Sweden along with the rest of Skåneland as part of the Treaty of Roskilde in 1658. King Charles XI of Sweden ordered most of the fortress demolished fearing that it was too exposed to a sneak attack from Denmark. The only thing that was saved for posterity was the old medieval tower core.
The tower became slowly a ruin and was restored during 1893–94. The stairs and the terraces up to the tower were built in 1903.
en.m.wikipedia.org/wiki/Kärnan