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Public-images-osm logo.svg tourism = attraction
Osm element tag.svg
A general tourist attraction.
Used on these elements
may be used on nodes
may be used on ways
may be used on areas
should not be used on relations
Status: In use

A general tourist attraction.

This tag is often used in addition with other tags (like historic=*) to express that the place is interesting for tourists.

Other possible way is to map the primary feature (eg waterfall) and add tourism=yes.