A popular legend claims that the famous pizza was invented at a restaurant in this alley.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

A surreal botanical garden with an even more surreal tour guide.

The sun acts as a key that only fits this giant keyhole twice a year.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Gnomes have their very own bonsai-landscaped settlement on a university campus.

The creator of the carousel's bingo-pinball hybrid survives in California's oldest gaming establishment.

This midcentury LA bar was the birthplace of tiki culture.

About 80% of all U.S. avocados are descendants of Rudolph Hass's glorious tree.

An unexpected and peaceful oasis on a hillside.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

The most unique castle in all of Southern California, entirely constructed from repurposed materials.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

The largest permanent Monopoly board makes one of the longest games even bigger.

Tiki luxury on Nob Hill.

This multi-story wooden waterpark offers homemade thrills.

This small museum dedicated to the painful memory of segregation is essentially a time capsule.

The best Tiki bar in Las Vegas.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

The ruins of the castle that chemicals built.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A surreal, Gaudi-inspired play space near an Anaheim community center.