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

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

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

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

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

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

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

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

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

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

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

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

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

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