St. Michael's Church is a very small church with a single hall and bell tower located on Margaret Island. It was originally built in the 12th century, but was completely destroyed during the Ottoman invasion of 1541. The ruins were excavated and rebuilt in the early 1930's.
The towers of the Church of St. Anne serve as kind of a reference point in Budapest and you can see them from just about everywhere. The church itself is considered to be one of the best examples of Italian Baroque architecture in Budapest. It's located in Buda on the banks of the Danube directly across from the Hungarian Parliament. Construction started in 1740 under Kristof Hamon and it was finished under Matyas Nepauer in 1762.
The Calvinist Church is located in Szilágyi Dezső tér, a square on the banks of the Danube river on the Buda side of the city. If you head up to the Fisherman's Bastion to enjoy the view of the city, you can't help but notice the Calvinist Church's beautiful roof decorated with colorful Zsolnay tiles. It's similar to that of the Matthias Church but somewhat more discrete. The church was built between 1816 and 1859.