Grace Church, New York

The church was founded in 1818, but James Renwick, Jr. designed the current, early Gothic Revival building that was began in 1843 and consecrated in 1846.

The carved marble reredos contains a central Venetian mosaic panel of the Savior's Ascension with Christ surrounded by his eight disciples, while two apostles in individual arcades flank either side.

Renwick also designed the reredos, which was carved by English sculptors Ellin and Kitson in 1878. Clayton and Bell, as well as Henry Holiday also made stained glass for the church.

The chancel floor is marble mosaic also by Salviati, Burke and Company showing three angels with emblems of the Crucifixion.

Sources:
The Churchman. Vol. 40. Nov. 22, 1879. 580.
Wikipedia
Grace Church 
MuseumPlanet on Panoramio
Panoramio
Mattron's flickr Photostream

St. Andrew's Church, Exwick

Built 1841-42 by architect John Hayward, this church was later enlarged in 1873-75 by Hayward at the expense of William Gibbs of Tyntesfield.

However, the church's planned tower was never built.

The original 1841 reredos by Simon Rowe was embellished in 1875 with Salviati mosaics of the Ascension of Christ flanked by two apostles on each side. Incidentally, the chapel at Gibbs' estate built at the same time was also decorated with Salviati mosaics and he may have suggested their use in Exwick.

Archival photo from 1936

Sources:
Wikipedia
Cherry, Bridget and Nikolaus Pevsner. Buildings of England: Devon. 5th ed. New Haven: Yale University Press, 1991. 387-390.
David Cornforth for Exeter Memories
Peter Holmes on Geograph
Current photographs of the reredos were kindly provided by Graeme Salisbury of St. Andrew's, Exwick

Church of St. James the Less, Pimlico

Designed by G.E. Street and built 1858-61, this was the architect's first London church.
 

The design for the mosaic of the "Ascension" on the arch above the chancel was copied from a 25 year old fresco in the church by G.F. Watts, which had deteriorated. The cartoons were taken by a former pupil of Watts, H.L. Moore. The Venice and Murano Glass and Mosaic Company installed the mosaic in 1886.

Sources:
St. James the Less, Vauxhall Bridge Road, London
The Art Journal. Vol. 38. London: 1886. 94.
John Salmon on Wikimedia Commons
NetNicholl's flickr Photostream

St. Andrew's Kirby Grindalythe

G.E. Street built this church in 1872-75 by incorporating parts of the original 12th and 14th century tower and belfry.

The mosaics covering the entire west wall of the nave portraying "The Ascension of Christ" were added by Salviati's Venice and Murano Glass Company in 1893 under the supervision of architect C.H. Townsend.

Sources:
A Church Near You
British Listed Buildings
Britain Express
Nigel Coates at Wikimedia Commons
Pevsner, Nikolaus and David Neave. Buildings of England: Yorkshire: York and the East Riding. New Haven: Yale University Press, 1995. 580.