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

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

Former meatpacking facility turned vertical farm and sustainable business complex.

To find the "unicorns of the deep" you've got to go downstairs.

Pumpkin-like gargoyles and grotesques peer down from the rooftop of this unassuming apartment building in Illinois.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

Hidden on the 7th floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

Factory that once supported an entire company town of 350.

The world's first motel is now an administrative building for an apple farm.

Here, visitors can swing with the waves of the Pacific Ocean.

A strange house built only at night, with rumored mystic inspiration.

A trail weaves through the verses of a poem illustrated by stone sculptures inspired by Native American pictographs.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

A mysterious monument covered in a binary code marks the heart of tech.

One of the largest Marian shrines on the West Coast stands rather unexpectedly in Silicon Valley.

A plaque outside the San Jose airport commemorates the insect's arrival to the West Coast.

The headquarters of a secretive order is also a beautifully-designed park.

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

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

A collection of haunted objects and macabre oddities under one roof.

Originally built as a promotional giveaway, this suburban house was designed to be an IRL version of the Simpson home.