Stroll through a wonderland of stupendous moss-covered trees.

A natural gas leak provides a flickering flame beneath a waterfall.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The oldest stone house in Paris was built by its most famous alchemist.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Hollowed out cedar log tubs set in an ancient towering forest.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Elevated freight railway turned wildly successful urban park.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

This structure among the trees was the result of divine inspiration.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

France's most famous cemetery, with some of its most curious tombs.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Rising from the sea like a stone monster.

The first declared National Monument in the United States.

A submerged archeological park still holds the wonders of a Roman Sodom.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Mysterious rocks that ring musically when struck.