An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

A "Titanic" superfan changed his name to Jack and set up this strange shrine to the blockbuster, complete with Korean food and Tarot readings.

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

60 feet of towering steel balances gracefully.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

A hollow cement depiction of time's inexorable effect on the human body.

Home to a protest movement, a bombing, and a dramatic change in labor history.

In one Santa Monica parking lot a mushroom cloud made of chains heralds a message of peace.

Giant origami crease patterns engraved in Santa Monica intersections may even be visible from space.

The blinking light atop the iconic landmark has been sending secret messages for decades.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

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

A memorial to the tens of thousands of Irish who fled to North America during the Great Famine.

Huge abstract sculptures of the Puerto Rican Flag.

A ghost town at the airport is now a refuge for blue butterflies.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A Looff creation in Santa Monica best described as “a California-Byzantine-Moorish-style fantasy.”