This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

Shop of curiosities with a dinosaur museum tucked in its basement.

A science teacher's dream.

A river with some unusual, and occasionally dangerous, habits.

Western New York's largest independent bookstore doubles as a historical repository of all things Niagara Falls.

A natural gas leak provides a flickering flame beneath a waterfall.

More than 350 million years ago, western New York was covered in a vast sea. Today, you can dig up the remains of the plants and animals that lived there.

Take an underground boat ride through a former hydraulic raceway that was built in the late 19th century.

A spooky defunct railroad tunnel now part of a sprawling trail.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

A charming remnant of 19th-century fishing towns sits on Michigan’s Leelanau Peninsula.

This 19th-century ghost town offers a stunning view of Lake Michigan and a journey through the region's industrial past.

Half of a waterfall goes into the river while the other half seems to disappear.

This freshwater spring fills with 10,000 gallons of water per minute.

The arboretum whose marshy soil sucked up the dreams of housing developers.

This cave holds a surprisingly colorful variety of geological oddities.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

European castle ruins in an American state park are actually the product of death and grief.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

The world's largest collection of the world's largest objects is in one small Illinois town.

Often referred to as the largest spring in America.

A historic, scenic mill that was forced to close due to overlogging.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

Around 50 million gallons of water flow from this spring every day.