Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

These rows of World War II-era bunkers were the scene of some of the infamous Mothman sightings.

This arcade is one of the last places to catch a public performance by the now-defunct ShowBiz Pizza's house band of animatronic animals.

The mounds on this coastal archaeological site reveal the history of the land’s first inhabitants.

This natural spring is the winter home to the largest gathering of manatees in the world.

A terrace reminiscent of Rome's Spanish Steps is tucked away in a little park in Washington, D.C.

This museum shines a light on the true Pilgrim experience in North America.

This large stone residence served as a field hospital during the Battle of Gettysburg between stints as a tavern.

A local prank turned town icon.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

A unique sculpture designed to raise stroke awareness.

The author of Uncle Tom's Cabin was neighbors with Mark Twain while living in this Connecticut home.

An iconic steel and chrome diner from the 1940s left empty for nearly 20 years is in danger of being demolished.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

East meets West in this Japanese-style garden featuring plants native to Maine’s Mount Desert Island.

This 19th century granite fortification is one of the most well preserved forts in New England.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

A collection of birdhouses await curious motorists and avian squatters.

This World's Fair showpiece was built in Chicago, but shipped to Maine.