Class B.
When Elzi proposed a Ghost Towns project, I soon thought of Topaz.

All I knew about the place was that it was one of the camps where the U.S. stashed a huge number of Japanese Americans right after the start of World War II, and that it was somewhere in Utah. I had no idea where in Utah, but thought it was somewhere in the southeast corner of the state. After the most cursory of searches, I discovered that the Topaz War Relocation Center was located a short distance west of Delta, Utah. I'd ridden to Delta a couple of times to have breakfast at the Rancher Café, so I was happy to learn that Topaz was well within reach.
Located at 39°24′40″N 112°46′20″W
I had it in my head that one of the barracks buildings had been preserved, but was soon set straight by friends who had been there. Nothing remains but foundations, gravel streets, debris, and a flagpole with some monuments. Finding the place on Google Earth was very intriguing, as you can see where the gravel tracks are that once were streets, and the concrete slabs that formed the foundations of the barracks and other buildings.
Andrew and I enjoyed the ride out to Delta, and lunch at the Rancher Café. It took a while to find Topaz because the scale of the street grid out there is so huge. Fortunately, there are signs directing you to the site once you get close, and signs like this one marking the corners.

I think when they say "NO motorcycles" they mean "NO dirt bikes tearing up the historic site and artifacts". Or at least I hope so.
Andrew had fun with some of the thousands of huge anthills that dot the site, and I had fun looking for foundations and other traces. We found these stoves sitting on one foundation:

There were bits of window screen, stovepipes, boards, lots of nails, fragments of bottles, bits of brick. It was all very interesting. It started to get dark, so we left for home. It got quite chilly before we reached Springville, and we stopped for hot chocolate in Nephi.
When I talked about our ride with a friend later that night, he described a flagpole and monuments to me, saying they were about a mile out in the middle of the site. Of course he turned out to be wrong about the location, but I headed out the next day to try to find them. I wandered the gravel tracks for a while, then finally decided to ride all the way around the site on the roads.
Finally, I found the flagpole and monuments, right on the road we had ridden to get there. We had just not ridden far enough, having been distracted by the corner marker sign. Of course it makes sense to make it visible from the "highway." Here's the "highway":

It was quite fun to zip long the "highway", which appeared to be a crumbling oil and gravel road with a layer of gravel on top. I had never ridden on gravel for so long, but there was no way we were walking or turning back.
Here is the flagpole, with the monuments:

Here is a map of the camp when it was in operation. Note that is a mile square!

I wish the buildings were still standing. The camp must have been impressive to see. "Ghost town" is such a fitting description.
The place is often described as a concentration camp, which is accurate even though the Nazis developed them in a different direction, for a far more sinister purpose, and on a larger scale. Topaz residents, after the camp had been in operation for a while, were allowed to leave for hikes and to hold jobs in nearby Delta.
The main plaque on the monuments reads:
Over 120,000 Japanese-Americans, two thirds of whom are U.S. citizens, are uprooted from their west coast homes and incarcerated by their own government. It is 1942, wartime hysteria is at a peak. They are imprisoned in ten inland concentration camps where they remain behind barbed wire, under suspicion and armed guards for up to 3 1/2 years. Topaz is one of the ten camps.
Without hearings or trials, this act of injustice is based solely on the color of their skin and the country of their origin. America's fear and distrust of these citizens-- precipitated by Japan's attack upon Pearl Harbor-- is placated.
Lost within this rush to judgement is the denial of constitutional rights, major losses of personal property and the labelling of its own citizens as enemy. Ironically, though this mass incarceration is spearheaded by thoughts of disloyalty, not a single case of espionage against the U.S. is ever discovered.
Indeed, the 442nd RCT and 100th Battalion, composed entirely of young Japanese-American boys (many of whom volunteer from internment camps), suffer major war casualties and go on to become the U.S. Army's most highly-decorated combat unit in its history.
Topaz is closed in October of 1945. The memory of Topaz remains a tribute to a people whose faith and loyalty was steadfast--while America's had faltered.
It wasn't until the days after our visits to the site that the words, and the phenomena they described, began to sink in. Imagine that you have been hauled off to a concentration camp in the middle of nowhere, losing your home, your job, your business, your friends and everything else. All because of your country of origin, or perhaps your parents' country of origin. You are stuffed in a barracks full of strangers, and watched over by armed guards as if you had just personally bombed Pearl Harbor. So what do you do? You volunteer to fight in a horrific war on behalf of the country that imprisoned you, and do so with such valor and skill that your unit is the most decorated in the Army.
Makes you think.