Glendalough
Glendalough is an old place where monks used to build churches and rockets out of stone. They never got them to fly, which is why they are still here to see.
In addition to "St. Kevin's Kitchen" (so-called because the bell tower was thought to be a chimney) and the famous round tower (another bell tower, in addition to being a library and place of refuge), the ruins include the main gate and part of the walls, a high cross, a large church, and of course a lot of tombs.