Castle of Juromenha

Portugal

Castle of Lamego

Portugal

Castle of Lanhoso

Portugal

Castle of Lapela

Portugal

Castle of Leiria

Portugal

Castle of Lindoso

Portugal

Castle of Linhares

Portugal

Castle of Longroiva

Portugal

Castle of Loulé

Portugal

Castle of Lousa

Portugal

Castle of Lousã

Portugal

Castle of Marialva

Portugal

Castle of Marvão

Portugal

Castle of Melfi

Italy

Castle of Melgaço

Portugal

Castle of Messejana

Portugal

Castle of Miranda do Douro

Portugal

Castle of Mirandela

Portugal

Castle of Mogadouro

Portugal

Castle of Monforte

Portugal

Castle of Monsanto

Portugal

Castle of Monsaraz

Portugal

Castle of Montalegre

Portugal

Castle of Montalvão

Portugal

Castle of Montemor-o-Novo

Portugal

Castle of Montemor-o-Velho

Portugal

Castle of Monção

Portugal

Castle of Moreira

Portugal

Castle of Moreira de Rei

Portugal

Castle of Moura

Portugal

Castle of Mourão

Portugal

Castle of Mytilene

Greece

Ancient/Byzantine/Genoese period

Castle of Mértola

Portugal

Castle of Mós

Portugal

Castle of Nisa

Portugal

Castle of Noudar

Portugal