Tracery from the Campanile of Giotto at Florence

In trolling through Project Gutenburg, I've found several books with architectural drawings.  I'll post the images that strike me as being evocative and useful to a DM who needs an inspiration or wants to provide a description of what the players see.

Source: John Ruskin's The Seven Lamps of Architecture.

Campanile is Italian for bell tower.  Imagine your players chasing a thief through the tower as the bells begin to toll.