• President James Garfield's National Historic Site is in Mentor. He ran for President in 1880, got elected, and was assassinated only a few months later. You can tour his house.

• President Ulysses Grant was born near the town of New Richmond. His birthplace can also be toured.

• How are caves formed? Most are made when underground rivers cut through soft rock, such as limestone. The Seneca Caverns were made by a huge fracture, or cut, in the limestone, and there is a river here now.

This Midwestern state is the birthplace of two presidents, and the home of some natural wonders, too. One is an island with huge “claw marks” made by a glacier.

The glacier “claw marks” are on Kelleys Island in Lake Erie. To get to the island, you take a short ferry ride out from the town of Marblehead. Glaciers are heavy with ice and rocks that make deep scratches as they go over other big rocks. On Kelleys Island, the marks are several inches up to ten to fifteen feet deep and up to thirty feet wide!

Near (but not on) Route 90 are the Seneca Caverns, which were discovered by two boys and a dog — they fell into its opening! Later it was explored, and it goes down seven different levels. A tour there takes you through some of it.

Ohio is the seventh largest state in population and has about 11.3 million people. Columbus, the capital and largest city, has about 670,000 people. Cleveland, the second largest city, has almost 500,000 people.