Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

Gold Rush-era tombstones line the park's paths.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

A promotional sun clock on the site of San Francisco's great raceway.

Amazing meticulous gardens of personal wood carvings, Hydrangea, Canna, and many other flowers.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Guns that have been defending San Francisco since 1904.

Sitting atop San Francisco's tallest hill, a cross honors the victims of the Armenian genocide.

Half of a house.

This whimsical park encourages its visitors and wildlife to roam on and around the various works of art.

Standing in for the first ship to navigate the Northwest Passage.

Site of the first radio and telephone broadcasting companies in Copenhagen.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

One man's prolific, decade-long quest to turn trash into artistic treasure.

A private home built to resemble the shape of a microscopic creature.

A sparse, solitary sequoia still stands as a living tribute to the famous conservationist who planted it—but it's dying.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Inside this museum, the history of the Walt Disney Family empire is on full display.

The famous greeting card maker owns a collection of paintings by the famed surrealist.

Both funky and traditional, it's the oldest of its kind in Indiana.

Europe's oldest still-operational tea farm also boasts a spectacular view.

This giant spider sculpture made from the iconic car is one giant visual pun.

This general store offers visitors a glimpse back into the 1930s.