Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The blinking light atop the iconic landmark has been sending secret messages for decades.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

This imprint of an old computer keyboard has a unique backstory.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The hallowed remains of a 900-year old Ancestral Pueblo great house.

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

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

The middle finger of modernity.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This open-pit mine is now an abandoned symbol of Bisbee's copper-mining heritage.

Home to the deepest rift anywhere on Earth.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

Boats and fish both find their way through this massive hydroelectric structure.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Multiple waterfalls and several historic CCC buildings anchor this state park in Oregon's Willamette Valley.

This incongruous small ferry across the Willamette River north of Salem, Oregon has been operating continuously since the 1850s.

World's largest porcine hairball sits in a collection maintained by Benedictine monks.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.