This massive statue of John Muir on the side of a California highway was carved from a redwood tree.

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

Four hundred granite steps were built into this massive rock by the National Park Service.

The last remnant of a tree that helped prove to the world that sequoias are real—and they’re spectacular.

The second-largest giant sequoia in the world.

This mechanical wonder towers above a river in Michigan's capital city.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Single runway interrupted by a busy road that cuts across its middle.

Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

The world's largest wooden structure.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

The final resting place of the great navigator, or maybe his brother.

Eat the ultimate iteration of Portugal's most beloved pastry.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

A living time capsule of the 1960s Richardson Bay water-front.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

One man's love of natural beauty led to the creation of this hidden granite monument.

This bright yellow building is packed with sweet treats from all around the world, from chocolate-covered crickets to whoopie pies.

This multisensory alley has the ability to remind bustling citygoers to stop and smell the roses.

At the top of the hour, this steam-powered clock's eight brass whistles play "Back Home Again in Indiana."