Locationless cache

A Locationless cache is a cache where the hider has found something interesting and sets a challenge to other geocachers to find more of the same item. Footsteps in Time is an example.
Locationless caches can be listed on Geocaching Australia.
Groundspeak no longer accepts these caches for listing on geocaching.com.

Most locationless caches can only have the same location logged once.

This software Locationless Proximity Analysercan help indicate used positions for Locationless caches.

A handy list of the geocaching.com locationless caches that were approved before the blanket ban can be found in this useful organiser here.