A simple plaque remembers a California island massacre that claimed more than 100 lives.

This massive redwood tree has a drive-thru tunnel carved out of its trunk.

An installation tells of the horrific 1964 tsunami that devastated Crescent City, California.

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

As a show of peace, a Japanese naval pilot gifted his 400-year-old Samurai sword to the Oregon town he bombed.

Historic funicular railway, believed to be the shortest railroad in the world.

This rare tortoise skeleton has been hanging around the downtown Los Angeles museum for over a century.

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

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Dozens of feral felines rule a segment of Hollywood's only graveyard.

Resting place of Hollywood's immortals is also site of summer film screenings.

A giant open-air sculpture made of over 200 full-sized boats.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A dedication plaque on this Boston tunnel is a microcosm of a massive, controversy-laden construction project.

The former home of a Boston physician whose murder led to a revolution in forensic science.

Dedicated to nine marines from Massachusetts who perished during the Beirut bombings.

Dedicated to a colonial woman who was hanged for being a Quaker.

A stone marker commemorating the first time sound was transmitted over wires.

Created by a local artist, these quirky sculptures each have their own names and personalities.

A luxury hotel constructed out of a former jail.