Pisa

Pisa was a city in Italy. It was home to the Leaning Tower of Pisa. (TV: Dinosaurs on a Spaceship)

In 1190, Ben Daheer asked the First Doctor if he was from Pisa, which he replied in the negative. (TV: "The Lion")

In the 13th century, the Eighth Doctor visited Pisa and stopped the Sulumian Thorgan from killing Fibonacci before the Italian had written the Liber quadratorum. (PROSE: The Gallifrey Chronicles)

In the early 21st century, Brian Williams visited Pisa and sent a postcard to Amy Pond and Rory Williams. (TV: Dinosaurs on a Spaceship)