Moszkowski's Caprice espagnol is a quintessential late-Romantic display piece full of Iberian flair. It is famous for its shimmering textures, rapid arpeggios, and virtuosic demands.
The piece requires highly developed stamina and precision in executing rapid, cascading arpeggios.
Comparable difficulty and character — good candidates for what to learn next.
Caprice espagnol (Op.37) is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 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 Caprice espagnol (Op.37) lasts about 5 minutes.
Caprice espagnol (Op.37) 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 Boabdil by Moritz Moszkowski, Allegro scherzando by Moritz Moszkowski, Rhapsody in Blue (Solo Piano) by George Gershwin — see the full similar-pieces list on this page.