I Fort, Military fortress in Kaunas, Lithuania.
I Fort is a military fortification on the western edge of Kaunas, built with red brick walls and concrete structures set into the surrounding terrain. Parts of the site now lie under water, creating a landscape where ruins and nature meet in an unexpected way.
The fort was built in 1882 as part of the western defensive ring that the Russian Empire established around Kaunas. During World War I, heavy German artillery fire caused serious damage and left parts of the structure permanently flooded.
The flooded sections of the fort have become a protected area where bat colonies spend the winter in the old chambers. Visitors who come in spring can see how nature slowly takes back the old brick and concrete structures.
The fort is best visited in the warmer months, when pathways are more accessible and guided tours are available. In winter, access is restricted to avoid disturbing the bat colonies that shelter there.
Although the fort was never captured in combat, it is today officially recognized as a protected site for bats, not only as a war ruin. This means the site is managed partly as a nature reserve, which is rare for a military structure of this type.
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