Mysterious stone tower featured in many alternative histories of the New World.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

Rumors of the occult haunt this upscale 1920s hotel.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

This Upper East Side apartment co-op was designed as a tuberculosis sanitarium.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

This miniature village stays behind in the Breuer Building, even as the museums around it come and go.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

The oldest standing structure in downtown San Diego.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

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

The classic Atari game's iconic aliens have invaded downtown San Diego.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

The quirky salon doubles as a retro museum run by the world's leading "hairstorian."

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

This giant spider sculpture made from the iconic car is one giant visual pun.

A 250 million-year-old rock formation has earned a rather unique nickname.

Instead of faces, these sculptures have barcodes—statements on societal dehumanization.

The so-called "Bridge of Thighs" in Palm Springs allows nudists to discreetly cross the road.

Although he donated over 3,000 acres to Los Angles, Griffith's life was marred by controversy.

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

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.