This is a view inside the Lale (Tulip) Mosque, a 12th century mosque. The rest of the building was closed when I visited, so no details.

This late 12th/early 13th century mosque was built by Lâlâ Muhlisiddin Paşa (Lâlâ = educator/private teacher of a prince). His tomb is adjacent to the mosque. Later on, as the term ‘Lâlâ’ became less used, the name was turned into one everyone understands: Lâle (= Tulip).
It is a quite large, rectangular building (32 x 33½ m), a basilica (or: pillar hall) with seven naves. The mosque was restored several times, last in 1968-70.

Correspondent: J.M.Criel, Antwerpen.
Source: ‘Tarihi Kayseri Cami ve Mescidleri’ – Doç. Ilhan Özkeçeci (1997) .