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St. Vitus Cathedral, located within Prague Castle, represents multiple historical periods (such is the case with much of Prague, actually), and it's absolutely gorgeous. It also houses St. Wencelas Chapel, where the king's remains are. That was also incredible and was in the process of being restored, but of course - no pictures allowed. Curses!

(Sidenote: According to our guide, King Wencelas was killed by his brother, and then his brother built the chapel for him and had him canonized. After seeing that chapel, I'm not sure if the murdered king should be mad or not?)

Prague Castle, Prague, Czech Republic.