A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought.

The retail price for the Proof 2025-W American Buffalo 1-ounce .9999 fine gold $50 coin will likely exceed $3,100, ...

A single coin can be worth a lot of money -- a pretty penny, one might say -- if it's rare and has enough historical ...

While there are many old coins worth more than their face value, this particular quarter boasts astronomical prices ...