The religious and secular buildings of Mamluk Tripoli comprise a fine example of the architecture of that time. The oldest among them were built with stones taken from 12th and 13th-century churches; the characteristics of the architecture of the period are best seen in the mosques and madrassas, the Islamic schools. It is the madrassas which most attract attention, for they include highly original structures as well as decoration: here a honeycombed ceiling, there a curiously shaped corniche, doorway or moulded window frame. Among the finest is the madrassa al-Burtasiyah, with an elegant façade picked out in black and white stones and a highly decorated lintel over the main door.