This looming, elaborate Norman church was founded in the 12th century by a Viking known as Strongbow. Only parts of the original cathedral, including the large crypt, remain from that time. Inside, view an ornate baptistery, a 15th century brass medieval lectern, and Romanesque arches and windows. Medieval stone carvings decorate the interior, including one of Strongbow himself in full armor.

Designed by Charles Lanyon and constructed between 1860 and 1873 on a site once home to an ancient nunnery. Today, it is the headquarters site to the Dublin Tourism Organization. The building is built in the Gothic style.

Built in 1190 BC, St. Audeon's Church is the oldest medieval church in Dublin. In the bell tower, there are three bells that date back to 1423, making them the oldest bells in all of Ireland. It is also located near the only gate, St. Audeon's Arch, left from the old city walls that date back to 1215. A Christian gravestone, which has been at the church since the 1300's, has earned the nickname the "Lucky Stone."

Dublin's only Catholic cathedral is a short stroll from the shopping area of O'Connell Street. The church was built in the Greek Doric style between 1815 and 1825.

This church is smaller than many of the more famous ones in Dublin, but it has its own interesting draw: The vaults below the cathedral are made of magnesium limestone, which dries the atmosphere to the point that bodies kept there are well preserved, some since the 17th century. The building dates from 1686 but has been significantly restored since then.