Buildings and architecture in general may not look as enticing as a snow clad mountain but capturing these has its own charm. There are number of ways in which you can capture an old cathedral or a tall building. Remember composition when taking these pictures. A tall building will look really nice when captured under moonlight or a cathedral may look really pretty if you keep stained glass windows in mind too.
This is one area which needs immense patience because unlike beautiful landscapes where results will most of the time be in your favour, here the results will totally depend on your settings and composition.
Give black and white a try and see what you get or try and keep lower shutter speed to get that warm feel when clicking inside a church.