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

The only rotating bar in New Orleans has been slowly spinning since 1949.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

The upstairs reading room is packed with millions of rare books, literary manuscripts, and historical treasures.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

An exquisite grouping of structures made from 10 tons of invasive saplings.

Frank Lloyd Wright died a year before construction on his largest public project even began.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

Monasteries on rock pillars, once accessible only by frayed ropes.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

A bit of retro transportation flair preserved in the world's largest department store.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

An artist's cute bronze subway sculptures belie his violent artistic past.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Become a prohibition rebel.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

This abandoned boat was left in place thanks to its rotting beauty.

Law-protected wreckage serves as a peculiar memorial for an almost forgotten World War II tragedy.

A living time capsule of the 1960s Richardson Bay water-front.

A man-made island in scenic San Francisco Bay.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.