I crossed the Tiber on my way to St Peter's at the _Ponte di Sant' Angelo_; directly on the other side of the river stands the castle of that name, an immense edifice formerly the _Moles Adriana_ or Mausoleum of the Emperor Adrian. It is of a circular form and is a remarkably striking object. From here there is a spacious street as broad as Portland place, which leads to the magnificent _Piazza_, where stands the Metropolitan Church of the Christian world, the pride of Christendom, the triumph of modern architecture, flanked on each side by a semi-circular colonnaded portico, which constitutes one of its greatest beauties and distinguishes it from all the other temples in the world. On the Piazza, considerably in front of this wonderful edifice and nearly in the centre, stands an immense Egyptian Obelisk, and at a short distance on each side of the Obelisk two magnificent fountains which spout water to a great height and which contribute greatly to the ornament of the _Piazza_. Now you must not expect me to give you a description of this glorious temple. I never in my life possessed descriptive powers, even for objects of no great importance: how then could I attempt to delineate the innumerable beauties of this edifice? Yet, vast as it is, the proportions of the façade are so correct, that they, together with the semi-circular colonnaded portico, serve to diminish its apparent size and to render its mass less imposing, but perhaps more beautiful. On this account it appears at first sight of less size than the Church of St Paul's in London. The beauty of the architecture, viz., of the façade and of the colonnaded portico would require days to examine and admire. What shall I say then of the wonders of the interior, crowded and charged as it is with the finest pieces of sculpture, columns of the most beautiful _verd antique_ and of _jaune antique_; the masterpieces of painting copied in mosaic; the precious, stones and marbles of all sorts that adorn the variety of magnificent chapels and altars; the immense baldachin with its twisted columns of bronze (the spoils of the Pantheon and of the temple of Jerusalem); the profusion of gilding and ornament of all sorts and where in spite of this profusion there seems _rien de trop_. At first entrance the eye is so dazzled with the magnificent _tout ensemble_ as to be incapable for a long time of examining any thing in detail. Each chapel abounds in the choicest marbles and precious stones: in a word it would seem as if the whole wealth of the Earth were concentrated here. Without impiety or exaggeration, I felt on entering this majestic temple for the first time just as I conceive a resuscitated mortal would feel on being ushered into the scene of the glories of Heaven. The masterpieces of painting are here perpetuated in mosaic, and so correctly and beautifully done, that unless you approach exceedingly close indeed, it is impossible to distinguish them from paintings.