A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

Legend says a primate-like cryptid prowls this otherworldy sliver of the Louisiana bayou.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

You can climb to the summit of Black Mountain, as long as you sign the waiver.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

This railroad overpass is said to be home to a murderous goat-man whose very legend has led to very real deaths.

Beautiful waterfalls grace a canyon visibly torn by a violent tornado.

An enormous natural sandstone bridge in Kentucky.

This lab's maddening silence is good for business but bad for sanity.

Only the original archway remains from the building where a false cry of "fire" started a panic that claimed more than 70 lives on Christmas Eve in 1913.

A tragedy and memorial that raised awareness about the dangers of unsealed mineshafts.

An easy-to-reach, century-old shipwreck in shallow and crystal clear waters.

On the shores of Lake Superior, a small group of monks makes sacred sweets.

Largest outdoor staircase in the United States.

This monument commemorates the only American soldiers to have directly fought Russians during World War I.

The site where Michigan launched its first rocket into space lies abandoned in the dense woods along Lake Superior.

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

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

This protected area in Lake Huron contains some of the world’s best-preserved shipwrecks.

A mysterious light in the wood, rumoured to be the the ghost of a railroad brakeman.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.