A giant concrete orb in far north Iceland marks the ever-shifting boundary.

A tiny village church in dramatic surroundings.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Hear the quietest sound from across the dome.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Illegal drag racing two stories beneath Chicago’s streets.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

These mansions date back to Chicago's days as a brewer's paradise.

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

A very classy 1920s-era bar right in Grand Central Station.

The lesser-known Alice sculpture of Central Park dedicated to the “godmother of American children.”

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

With a history dating back to Victorian times, this architectural gem is a rare New York tourist haunt worth visiting.

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

This installation turns abstract economics into a stark, public spectacle.

Yo, Adrian!

The world’s first penitentiary, meant to be humane, drove men insane.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

Phil Mortillaro uses keys to bring art back to the Village.

Elevated freight railway turned wildly successful urban park.

This slender three-story building has also had several famous residents.