Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

This urban oasis is a marvelous meld of music and landscape architecture.

The giant birds honor two native North American species.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

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

A 19th-century cabin built into a hollowed-out Sequoia tree.

Quite simply the largest tree in the world (by volume).

An alley covered with 20 years of bubble gum.

A massive volcanic plug is now a protected area that hosts a number of bird species.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

Haunting and beautiful trees, doomed to die.

The oldest U.S. Government building in California, and it's State Historic Landmark #1.

More than 700 species live within this murky marvel of a swamp on California's coast.

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

This Costa Rican topiary park is a surreal garden of unearthly delights.

A monument to the conquistador became increasingly controversial in the very city that he founded.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.