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.
Here is the basic floor plan of the temple, as found in Thomas Carter's Building Zion. This floor plan is based on how the temple was originally built. It is basically unchanged, except that the "Unknown Use" on the second floor is sealing rooms (and likely originally was), and the passage on the main floor now holds locker rooms.
You'll notice that, like the original Logan Temple, the Manti Temple's endowment rooms begin on the first floor and end on the second, meaning that the Garden and World rooms are kind of "in-between floors," something you can't notice from the outside. But first, you come in through the annex.
The annex hallway was constructed in a renovation during the 1900s, replacing the original annex. Still, I think it was done perfectly. It matches the actual temple's architectural qualities very well--in its doors, door knobs and hinges, moldings, and other characteristics.
C.C.A. 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 is located in the lobby. 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. Directly beneath the mural is the old sacrament table that used to stand in the Logan Temple's assembly hall.
The chapel that patrons sit in while waiting for a session to begin is also in the annex. It 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) . The annex also has other interesting artwork on its walls--a Nauvoo-era temple apron belonging to Isaac Morley just past the recommend desk, a sketch of John Taylor by John Hafen in the men's locker room, a portrait of a contemporary Church leader by Dan Weggeland, also in the men's locker room...there is some beautiful artwork.
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 baptistry has some wonderful murals, done by Robert L. Shepherd in 1948, when he was also painting the Garden Room.
Patrons attending an endowment session, as they enter the temple proper, immediately turn left to enter the creation room.
The creation room is the oldest surviving mural present in an LDS temple (the St. George temple murals came in the 1930s, the Logan Temple was gutted, 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 was painted by C.C.A. Christensen. In the early 1980s, conservationists noticed that this mural was in the worst shape of the three, and took measures to preserve it.
The book C.C.A. Christensen: Mormon Immigrant Artist provides some detailed pictures of this beautiful mural.
At the front of the room, on the left side, begins the creation story--the formation of the earth.
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.
Here's a view of the front of the room:
From the garden room, patrons head up that staircase on the right into the world room. This mural were added in 1947 by Minerva Teichert. I have absolutely no information on the original world room mural, other than it was probably done by Dan Weggeland. Apparently, water damage also necessitated this mural having to be redone.
Last is the Celestial Room:
This sealing room is connected to the south side of the Celestial Room. It is definitely one of the most ornate sealing rooms in the Church (that I know of, anyway).
One of the most stunning parts of the temple are the two wooden spiral staircases in the west towers.
Like other assembly halls, there are two sets of pulpits: one on the west end and one on the east end, representing the Aaronic and Melchizedek Priesthood, respectively.