Lonely Planet review for Münster Basilica
A good place to start exploring Bonn’s historic centre is on Münsterplatz, where the landmark Münster Basilica was built on the graves of the two martyred Roman soldiers who later got promoted to be the city’s patron saints. It got its Gothic look in the 13th century but the Romanesque origins survive beautifully in the ageing cloister (open till 5pm). It's interior is redolent with centuries of burnt incense. On the square outside the church, a buttercup-yellow baroque Palais (palace; now the post office) forms a photogenic backdrop for the Beethoven Monument (1845).