Journey through various trails to discover a land before time along the Chazy Fossil Reef.

Mysterious rocks that ring musically when struck.

Train fans from all over flock to this railroad viewing park where three lines converge.

Stunning examples of Russia's 18th-century wooden architecture.

The oldest Buddhist monastery in Mongolia has survived centuries of invasions, political shifts, and religious purges.

A mysterious phallic rock on the grounds of a Buddhist monastery.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

This spectacular track has run continuously since 1882.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The winter home of thousands of beautiful snow geese and sandhill cranes.

More than 21,000 images fill this overlooked gem of a prehistoric site.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

This railroad tunnel was once the longest in Massachusetts.

One of the world's largest model railroads is a mind-boggling achievement.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

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