Santa Catalina Arch One of the most recognizable sights in Antigua, Guatemala is the Arch of Santa Catalina. This yellow-orange clocktower was built in the 17th century and connected the convent of Santa Catalina to a school, allowing nuns to pass from one build to another without leaving the confines of their convent. In the 1830’s the clocktower was added to the arch. You can find it on 5th Avenue North, and is free to see. If you are on your way to/from La Merced Church, you'll pass right underneath the arch. And