Carl Tausig's 'Das Geisterschiff' is a virtuosic and dark-hued tone poem for the piano based on a poem by Strachwitz. It features intense tremolos and sweeping arpeggios that capture the ghostly atmosphere of the narrative.
Technical proficiency in maintaining high-velocity octave runs and consistent tremolos is required for this work.
Comparable difficulty and character — good candidates for what to learn next.
Ballad (Das Geisterschiff) is rated Henle level 8 of 9 — concert repertoire, roughly diploma level. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 8 — meaning you can already play level 7–8 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Ballad (Das Geisterschiff) lasts about 8 minutes.
Ballad (Das Geisterschiff) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include 'Das Geisterschiff' by Carl Tausig, Ballade No.2 by Franz Liszt, Pictures at an Exhibition by Modest Mussorgsky — see the full similar-pieces list on this page.