The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.

Built to be the ideal penitentiary, this abandoned panopticon saw several revolts and even a prisoners' coup.

A founding document of the European Union was written on an island where Roman emperors once banished women.

This tiny chapel atop a sea stack is dedicated to the patron saint of Ponza, Saint Silverius.

This abandoned semaphore station hearkens back to the days of the optical telegraph.

This crescent-shaped beach is said to glow under the light of a full moon.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

Lake within a lake.

Little island known for its massive beachfront "flowerpot" pillars.

This natural sea cave hides a small wonderland of natural turquoise beauty.

Taxidermy and miniatures come together to create this unique museum.

The artwork honors those who are dedicated to preserving the beautiful Michigan peninsula.

Home to over 300 antique cars and motorcycles, including Thomas Edison's Model A.

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

The remains of a failed canal can be found in several towns near Lake St. Clair and is known historically as "Mason's Folly."

A place for ship-lovers to watch the passage of freighters traversing the Great Lakes while learning about their history.

The plants form a living library and laboratory for researchers and students at Michigan State University.

Large pioneer village showcasing life during boom times.

Every winter, water dripping from a pole creates an ever-changing ice sculpture.

Reason for Michigan's potential diamond mine.

It leads to a former hospital’s old root cellar.

These gardens recreate unique and endangered Michigan habitats.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.