An abandoned gun-funded 19th century utopia.

An abandoned Depression-era zoo hidden just off the highway.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A former copper mine which became a truly unsuccessful prison.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

Over fifty whirling pools left by the glacial age.

America's oldest archaeological site or a muddled case of wishful thinking.

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

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

An unusual round church in London with a Templar past.

A wunderkammer hidden on the top floor of the Hartford statehouse.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Rebuilt remains of a temple to Roman god Mithras.