Here's one I went to not long ago...the completely abandoned, former mining town of Mandan in the Upper Peninsula. A tiny ghost town hidden within the forest off US 41, down a one-lane, slightly overgrown dirt road.

Courtesy of Google Maps

Here's what Wikipedia says about it:
"Mandan is a ghost town in Grant Township, Keweenaw County, Michigan, on US Highway 41, about twelve miles south of Copper Harbor. It was the site of the Mandan Mine and the Medora Mine, two copper mines which were organized in 1864 and worked intermittently until their abandonment in 1909."

Screenshot courtesy of Black Sheep Nation, youtube

This town has NO residents whatsoever but still has a couple of old houses still standing...and - hidden among the weeds, bushes & trees -  are plenty of old building/home foundations where houses used to stand.

Courtesy of Google Maps

If you search, you can find where the center of town was: on the northern corner of what was once an intersection, hidden within all the bushes and underbrush, are the remains of what was once a general'll have to push through the shrubbery to be able to see it. This satellite picture shows the town in winter: old houses and foundations are clearly seen.

Courtesy of Google Maps

Mandan has NO legitimate, official signage...the only way you'll know what tiny dirt road to turn down is a board that someone stuck in the ground with the name "Mandan" wood-burned into it, as you can see in this picture.

Check out a visitor's video above...then take a hefty roadtrip to the Keweenaw peninsula in the U.P. and visit this eerie little town for yourself. Be respectful.