Less a museum than a bizarre fantasy world created by artists and engineers.

Giant granite rocks standing end-to-end like a train of circus elephants.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A collection of sculptures and trails that appear to change with the seasons.

At 431 feet and 10 inches, this is the longest historic covered bridge in the United States.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

What is it about mushrooms that makes people wish they lived inside of them?

A castle built by an eccentric medieval enthusiast in rural Ohio.

Inside, ancient treasures. Outside, modern contradictions.

The first blast furnace in the United States that used coal and coke fuel instead of charcoal to make pig iron.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

This outdoor exhibit features a historic wooden dam once used to help boats navigate the Ohio River.

This California artist's front yard acts as a gallery for his unique, scrap metal animal sculptures.

Once damaged by Hurricane Agnes, this bridge is now on the National Register of Historic Places.

Built by the patriotic residents of Boonsboro in a single day.