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Tag:historic=castle
The tag historic=castle is used in OpenStreetMap for various kinds of structures,
most of which were originally built as fortified residences of a lord or noble.
The scope of the tag currently also includes non-fortified residences like palaces;
and also fortresses, which were not always a residence for nobility.
Have a look at the key castle_type=* for common sub-types of this tag.
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