Encyclopedias, Almanacs, Transcripts, and Maps
- Castel Sant' Angelo
- Castelar y Ripoll, Emilio
- Castellani, Sir Aldo
- Castello, Bernardo
- Castello, Giovanni Battista
- Castello, Valerio
- Castellón de la Plana
- Castelnau, Michel de
- Castillo de San Marcos National Monument
- Castillon-la-Bataille
- Castle Clinton National Monument
- Castle Pinckney
- Castle Shannon
- Castlebar
- Castlemaine, Barbara, countess of
- castoreum
- Castracani, Castruccio
- Castrén, Matthias Alexander
- Castriota, George
- Castro