The 65 metre tall Minaret of Jam, built by Sultan Ghiyat Ud-Din Muhammad ben San, in around 1190, with Kufic script and verses of the Koran on the exterior, UNESCO World Heritage Site, Ghor Province, Afghanistan, Asia

The Mausoleum of Ghiyas-ud-Din Tughluq (Ghiyath-al-Din) at Tughluqabad in Delhi, India, Asia

A tree stands outside the walls of the ruined Tughluqabad Fortress, constructed under Ghiyas-ud-Din in 1321 AD and abandoned in 1327 AD, in Delhi, India, Asia

The Mausoleum of Ghiyas-ud-Din Tughluq (Ghiyath-al-Din) at Tughluqabad in Delhi, India, Asia

An Indian man visits the dungeons of Tughluqabad Fortress, constructed under Ghiyas-ud-Din in 1321 AD and abandoned in 1327 AD, Delhi, India, Asia

The 65 metre tall Minaret of Jam, built by Sultan Ghiyat Ud-Din Muhammad ben San, in around 1190, with Kufic script and verses of the Koran on the exterior, UNESCO World Heritage Site, Ghor Province, Afghanistan, Asia

Inside the Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

Timurid tilework on tower of the Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

The Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

Timurid tilework on a tower of The Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

Tomb of Ghiyasuddin Tughlaq (Ghiyas-ud-din Tughluq), Delhi, India, Asia

Inside The Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but built in its present form by Malik Fakhruddin in 1305 AD, Herat, Afghanistan, Asia

Inside the Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great but built in its present form by Malik Fakhruddin in 1305 AD, Herat, Afghanistan, Asia

Inside the Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

Well inside the Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

The Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

Timurid tilework on a tower of The Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

View from the Citadel (Qala-i-Ikhtiyar-ud-din) with the Friday Mosque (Masjet-eJam) in the background, Herat, Afghanistan, Asia

View from The Citadel (Qala-i-Ikhtiyar-ud-din), Herat, Herat Province, Afghanistan, Asia

Inside the Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

Inside the Citadel (Qala-i-Ikhtiyar-ud-din), originally built by Alexander the Great, but in its present form by Malik Fakhruddin in 1305AD, Herat, Herat Province, Afghanistan, Asia

View from The Citadel (Qala-i-Ikhtiyar-ud-din), Herat, Herat Province, Afghanistan, Asia

Dome, Sayfiddin Boxarziy Mausoleum and Mosque, (Sayfiddin Baxorzi and Sayf Ad Din Bokharzi), Bukhara, Uzbekistan