These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

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

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

Rare recess caves fill this unbelievably beautiful Ohio park.

The largest earthwork effigy in the world.

Where beautiful signs live on forever.

A series of 33 stone markers maps an ancient 55-mile transportation route.

The honor of highest point in Michigan was almost given to the wrong peak before this mountain won out by 11 inches.

Large one-man sculpture park in Michigan.

There are two legends behind the origin of this unusually tall sanitary structure.

The rusted remains of an ill-fated freighter lie just off the coast of South Manitou Island in Lake Michigan.

Covering 37 subterranean acres, this Armillaria gallic is a famous fungus with its own festival.

Standing guard on top of an old, vacant ice cream shop.

This feline raises a friendly paw at drivers barreling toward the freeway.

This shallow cave got its name from copious amount of human bones found inside.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

A lavender labyrinth so large it’s visible on Google Earth.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

The former home is said to be haunted by the ghosts of the beloved mayor and his wife who lived here.

At HopCat, a marker honors fictional creatures with the ability to travel the missing dimensions of Kcymaerxthaere.

The Kalamazoo factory has 100 years of instrument-making, and one big wartime secret.

A heavenly experience, right here on Terra Firma.

The seamy, underground secrets of Portland's criminal past.

This Portland Art gallery doubles as a studio that supports adults with intellectual and developmental disabilities.