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"Sitting in the middle of the Rhine near Kaub, this tiny medieval fortress was built by King Ludwig in 1326 to collect tolls from passing ships and became a lucrative stronghold for feudal lords. Its pointed southern fortification gives it a ship‑like appearance and helps protect the structure from winter ice floes; it can only be reached by a local ferry from Kaub and is roughly a two‑hour drive from Frankfurt." - Alexandra Karplus