Just a short day trip from Dublin, the Rock of Cashel is a historic site and one of the most popular tourist destinations in Ireland. This impressive feat of medieval architecture is also the site of one of Cashe's oldest buildings, which dates back over 1,000 years.
It's also the perfect place to visit around St. Patrick's Day, as the saint himself reportedly visited the site in order to convert King Aenghus to Christianity.
While the monument itself might be manmade, the lush scenery surrounding it is just as beautiful.