Toledo is one of the most visited cities in Spain. Declared a UNESCO World Heritage Site in 1986, it’s known for the medieval Arab, Jewish, and Christian monuments in its walled old city. The historic city center is full of many oddities of the past, like the so-called “smallest window in the world.” 

This window is located at 3 Sillería street, specifically on the wall of the Casón de Los López. Once a large Toledo home, the building dates back to the 16th century. Restored in 1973, the building currently houses a restaurant (now closed). According to the Guinness Book of World Records, this small exterior-facing window is, indeed, the smallest in the world. The window is smaller than the palm of an adult’s hand.

At the base of the medieval window is an inscription that translates to: “Thank you, Allah.” Others claim that the word Talaytula is written, the former Arabic name of the city. The actual function of this small window is still unknown. Just to the right of the minuscule window is another, larger window that overlooks the interior of the Casón de los López.