Church at Rome, is built, it is alleged, over the tomb of St. Peter, and on the site of the basilica erected by Constantine and Helena in 306. The original structure after falling into decay was begun to be rebuilt in 1450, and finally consecrated by Urban XIII. in 1626. It is the largest and grandest church in Christendom, covers an area of over 26,000 square yards, the interior of it in length being 206 yards, the transept 150 yards, the nave 150, and the dome 465. It contains thirty altars, and is adorned with numerous statues and monuments.