Caves don't have to be big to be beautiful. The Orleška Jama near Sežana (Slovenia) for instance: it's only 138 meters long and 33 meters deep, but it's absolutely interesting.
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After descending the 15 meter entrance pit you enter the cave. A 3 meter drop into the main chamber leads to a second and a third chamber, each richly decorated with beautiful speleothems. Don't forget to bring your camera!
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<bdo lang="en" dir="ltr"><a href="//commons.wikimedia.org/wiki/Commons:YouTube_files" title="Commons:YouTube files">YouTube</a>: <a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=fqDXAKnaZas"><bdi lang="">Orleška Jama (SLO)</bdi></a> – View/save archived versions on <a rel="nofollow" class="external text" href="https://web.archive.org/web/*/https://www.youtube.com/watch?v=fqDXAKnaZas">archive.org</a> and <a rel="nofollow" class="external text" href="https://archive.today/https://www.youtube.com/watch?v=fqDXAKnaZas">archive.today</a></bdo>