A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

Relive a Polish uprising via an enormous, century-old cyclorama.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

Over fifty whirling pools left by the glacial age.

A single light illuminates one man's overshadowed contributions to street lamp history.

The oldest still-operating tavern in the United States was once owned by a pirate.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

This series of landscape dioramas tell the story of New England forestry in exacting miniature detail.

Mass Grave of 48 colonists killed in a raid by Native Americans and the French in 1704.

This rare symbol of Eastern philosophy in the West has been created over years of painstaking construction by the local community.

This roadside attraction attracts kids with dinosaurs before blindsiding them with geology.

Surrounded by lonely toys, this Massachusetts gravestone marks the final resting place of six children who were murdered by poverty.

The vaguely man-shaped root that ate the body of the founder of Rhode Island.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

This little-known rival to the Library of Congress houses one of the largest collections of pre-1876 American books, newspapers, and manuscripts.

A grave surprise in the downtown area of New England's second-largest city.

The highest point in Connecticut was incorrectly memorialized before surveyors discovered the actual spot.

All that remains of this Massachusetts town, demolished in the name of progress, is a stone marker.

This boulder with a 200-word legal dedication to God has remained hidden in the woods for over 150 years.

Founded by the famed children's book artist, this museum spreads an appreciation of the arts through picture books.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

It's not a typo, now say it five times fast!