A Place For Prayer

A mihrab is a "niche or marker used to indicate the direction of prayer usually in a mosque." (Arch.net's Digital Library, Dictionary of Islamic Architecture)

Mihrabs:

Mihrab of the Mezquita, Cordoba, Spain
Photo by Looi

A mihrab from 1354–55 in Iran, Isfahan
From the Islamic Art collection of the Metropolitan Museum of Art, NYC

Arched Mihrab
Photo by Swamibu

Mihrab in Qila Kuhna Masjid, Purana Qila, Delhi
Photo by Russ Bowling

Mihrab in Hagia Sophia, Istanbul
Photo by Radomil

Zaouia Sidi Abid el Ghariani mihrab
Photo by Damian Entwhistle

Links:
~A carved wooden mihrab in Turkey at the Virtual Museum
~Info on Seljuk ceramics
~An explanation of mihrabs & other parts of a mosque from a UK school site.
~A Welsh resource pack for teachers with an outline of Islam
~Info about Islamic art with lesson plans on Arabic script and Geometric design