About as hidden as can be, this specialty coffee shop is wedged between multi-story buildings at the end of a dark, skinny alleyway in Seoul.

A giant knight, sex education, date shakes, and Jesus coexist happily in this Coachella Valley desert oasis.

The oldest standing structure in downtown San Diego.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

This private residence was the template for one of the most beloved television homes of all time.

A multimedia experience that chronicles the atrocities of racism.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

The ghost town that ended up on Ebay.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Quite simply the largest tree in the world (by volume).

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

World-famous, Pink's still manages to keep its prized cult fetish status.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The ghostly remains of an accidental sea.

America's most famous piece of self-built architecture.

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

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.