The longest fence in the world stretches over 3,000 miles to keep the dingoes out.

Not a single witness can attest to the creation of the world's largest geoglyph.

Lonely industrial sculptures in South Australia created by a mechanic turned artist.

Located on top of mines that run through Broken Hill.

A unique collection of Western and Japanese-style graves.

Hidden behind a YMCA stands the remains of a ceremonial site that dates back hundreds of years, whose ground is still considered sacred to many Hawaiians.

A unique set of caves that spits waves back out into the ocean.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

Happy harbor seals frolic and snooze on this warm, sandy stretch of coast.

Inky sludge oozes to the surface of this beach thanks to a rare natural tar seep.

With its peeling paint and faded sign, this theater-turned-recycling plant is a nostalgic relic of 1950s Americana.

For over 20 years, Lil Toot has delighted guests with narrated boat rides between Stearns Wharf and Santa Barbara Harbor, becoming a beloved local legend and top-rated experience for visitors.

Colorful Native American paintings are hidden within this small cavern.

Don't blink or you'll miss it.

A tribute to the statues of Easter Island along Route 66.

The second-largest giant sequoia in the world.

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.

This small shack near the entrance to Sequoia National Park has been in almost continuous operation for the last century.

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

The remnants of a creative early method of wildfire prevention.

This Native American settlement dates back to the Pueblo II period.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.