The large "Protestant St. Peter's" measures 114 m long and 73 m wide. The dome is intricately decorated with mosaics. Other notable artworks include Sauer's Organ, the Neo-Baroque pulpit and stained glass windows designed by Anton von Werner. The main altar dates from 1850.An excellent view of the dome and entire interior can be had from the dome's gallery. The 270-step climb to the top is more pleasant than at most cathedrals, with a wide stairwell, plenty of places to pause, and interesting historic photos and models to look at along the way.The most historically significant feature of the Berliner Dom is the crypt, with more than 80 sarcophagi of Prussian royals. The most impressive are the tombs of Frederick I and his queen, Sophie Charlotte. But non-enthusiasts may not find the tombs terribly interesting.