Beneath Lithuania's gentle rolling landscape lies a hidden world of caves, tunnels, and bunkers. Natural sandstone caves carved by ancient rivers, Cold War-era military bunkers built to withstand nuclear attacks, and medieval tunnel systems beneath old town centers all await exploration. These underground spaces reveal geological wonders and secret histories that most visitors to Lithuania never discover.
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A vast network of 19th-century military tunnels beneath the Kaunas Fortress — one of the largest defensive structures in Eastern Europe, now open for atmospheric underground tours.
The ancient underground chambers beneath Vilnius Cathedral, containing royal tombs, medieval frescoes, and the remains of earlier pagan and Christian temples dating back centuries.
Lithuania's most dramatic karst landscape — over 9,000 sinkholes, underground rivers, and dissolving bedrock that occasionally swallows roads and fields without warning.
A network of centuries-old tunnels beneath Kaunas Old Town, once used for storage, defense, and mysterious purposes — now partially accessible for guided tours.
A former secret Soviet nuclear missile base hidden in the Žemaitija forests — now a museum where visitors descend into underground silos that once housed nuclear warheads aimed at Western Europe.
The underground tunnel network connecting the massive Kaunas Fortress ring — miles of brick-lined passages built by the Russian Empire that have survived for over a century.
A reconstructed Lithuanian partisan underground bunker — where anti-Soviet resistance fighters lived and fought from hidden forest shelters during the decade-long guerrilla war.
A network of Cold War-era military bunkers hidden in forests near Šiauliai — once part of the Soviet air defense network protecting the Baltic military district.