1. St. George Temple (1877)
2. Logan Temple (1884)
3. Manti Temple (1888)
4. Salt Lake Temple (1893)
5. Laie Temple (1919)
6. Cardston Temple (1923)
7. Mesa Temple (1927)
8. Idaho Falls Temple (1945)
The Manti Temple is probably the best-preserved example of pioneer architecture. Dedicated in 1888 and located in rural Sanpete Valley, it has remained relatively untouched from modern renovations.
I pulled a basic floor plan of the temple from Thomas Carter's Building Zion. This floor plan is based on how the temple was originally built, so there are some inaccuracies and changes. I've kept his first floor plan here, but there have been some changes to the baptistry layout, the tunnel that originally went through the bottom of the east tower now holds locker rooms, and there have been some sealing rooms added. I've drawn my own plans of the second and third floors.
Here's a old and a newer photo as you are looking in toward the temple:
A newer photo looking back toward the annex entrance:
The annex has seen many renovations since it was originally built, but it still matches the actual temple's architectural qualities very well--in its doors, door knobs and hinges, moldings, and other characteristics.
The annex also has interesting artwork on its walls--a Nauvoo-era temple apron belonging to Isaac Morley just past the recommend desk (visible at the end of the hall in the image above), a sketch of John Taylor by John Hafen in the men's locker room, and a couple of C.C.A. Christensen paintings.
Christensen (the same artist who painted the creation room mural) painted two murals of the temple hill in 1889. One of them shows the temple hill how it looked when pioneers first arrived in the Sanpete Valley. This one is located at the second stairway, where patrons go up or down for the locker rooms:
The other shows the temple completed. This one used to be located in the lobby, located directly above the old sacrament table that used to stand in the Logan Temple's assembly hall. In the 2020s renovation, it was replaced by an painting of Christ as the Good Shepherd, and moved to the back of the annex chapel. It turns out that when they found this painting, green had been crudely painted over the temple hill to make it look like the grassy knoll what the temple actually sits on. When preservationists removed the green, they were able to uncover the grant stairway leading to the temple, which was in the original plans.
The annex chapel that patrons sit in while waiting for a session to begin also has a beautiful, large painting of Christ with children at the front, painted by John Hafen in 1906 (it's a copy of Benard Plockhorst's Jesus Blessing the Children, which you can view here).
At the end of the annex hallway is the entrance into the temple proper. Going to the right leads to sealing rooms, the spiral staircases, and the baptistry.
The cast-iron baptistry font and oxen were made in Salt Lake City in 1885-6, by the same mold based on the St. George Temple and used for the Logan Temple. Like St. George, these oxen don't have hooves, it just ends with legs.
The baptistry has some wonderful murals, done by Robert L. Shepherd in 1948, when he was also painting the Garden Room. On one wall, murals show the baptism of Jesus Christ and Joseph Smith and Oliver Cowdery baptizing each other. Directly above the font, doves and stars are painted.
Finally, scriptural quotations with landscape backgrounds on the other two walls were added by Wes Wright in the 1980s renovations. Overall, it's a colorful baptistry. In the baptism's lobby is George Ottinger's large painting, The Baptism of Limhi, painted in 1888 as the first image for George Reynolds' The Story of the Book of Mormon. Whether it's a copy or the original, it's a monumental piece to look at.
The creation room is the oldest surviving mural present in an LDS temple. It was painted by C.C.A. Christensen in 1886. (The St. George temple murals came in the 1930s, the Logan Temples murals were removed in its 1970s gutting, the Garden and World room murals in Manti had to be redone in the 1940s, and the Salt Lake Temple came 5 years after Manti). This mural is the hardest to care for, because Christensen painted it directly on the plaster--it can't be removed. In the early 1980s, conservationists noticed that this mural was in the worst shape of the three, and took measures to preserve it. In the 2020s renovation, they painstakingly went over the mural one inch at a time, removing an old varnish that was mixing with the paint and putting on a new varnish to preserve it. I believe they originally planned to redo the mural before deciding to go to the effort of preserving it. It looks great!
The book C.C.A. Christensen: Mormon Immigrant Artist provides some detailed pictures of this beautiful mural.
As you progress clock-wise around the room, each day of the creation is told in the mural. Here is the second day; the separation of the seas from the waters. The third day (the creation of heavenly bodies) is visible in the wide shot of the room above, just left of the door. The portion of the third day has been heavily painted over by later artists in attempts to restore the original.
On the right side of the door is the fourth day; the creation of plants. (The line down this photo is in the original book; I believe this is where the walls come together in a corner.) Christensen used hollyhocks (common in Utah and his home country, Denmark) in the foreground; in the back are lombardy poplars (a common tree planted by pioneers in Utah).
Finally, the back of the room and the left (east) side shows the creation of animals. This begins with some depictions of Jurassic-era creatures and ferns. I love that Christensen included these drawings. For an interesting look at the context of these creatures, see this article.
From the garden room, patrons head up a larger staircase into the world room.
This sealing room, sometimes called the blue or persian room, is connected to the south side of the Celestial Room. It is definitely one of the most ornate sealing rooms in the Church. It serves as the temple's holy of holies, and served as such for the Church before the Salt Lake Temple was dedicated in 1893. The details are incredible. A frosted window in this room looks over the world room. It was likely placed there to provide natural light.
All of the pioneer temples, including Nauvoo, have spiral staircases. However, only Manti has an open design. In St. George, Logan, and Salt Lake, there is a central column. (The rebuilt Nauvoo Temple doesn't have one, so you get a similar view.)