Started as a kitchen garden, now the second largest botanical garden in the world.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

One of the largest Masonic temples in the world, created at the height of the oil boom in ostentatious style.

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.

These massive mitts are made of 30 tons of devotional bronze.

When you can afford only half a road, you build only half a road.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

An acoustic anomaly with a mysterious cause.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

A museum dedicated to the alleged Roswell Incident.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Dozens of lights dangle from the branches of what may be the brightest tree in Los Angeles.

This Hollywood dive houses a mural painted by the artists who animated its namesake film.

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

Friendships have been forged over ham and eggs every Wednesday morning for nearly a century.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

A quirky collection of figurines backdropped by city views is hidden next to a popular restaurant in the Hollywood hills.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.

Magical-looking cottages that inspired one of the most famous animated films ever.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.