St. Mary’s Cathedral, located atop Toompea Hill, is the oldest church in Tallinn, surviving the 17th-century fire. Originally Roman Catholic, it’s now Lutheran and houses the Archbishop of Tallinn. Designated a national monument in 1995, its architecture blends Romanesque and Baroque styles, and it holds historical treasures like tombstones and sarcophagi. Notable figures such as Jindřich Matyáš Thurn and Samuel Greig find their final resting place here. Tallinn