The 13th century Cathedral of St. Bartholomew is in Plzen in the Czech Republic. It's best known for its 103 meter high tower, making it the country's tallest, as well as the third tallest building of any type in the Czech Republic.
Climbing the 301 steps to the top gives you a commanding view over Plzen and some of its other sights, including the brewery, and the ruins of Radyne Castle. Inside, one of the highlights is the 13th century statue of Mary and Christ in the Neo-Gothic altar.
Also worth seeing is the Sternberk Chapel with its Renaissance paintings and its Art Nouveau style altar.