An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

No Gordon Lightfoot song, only a barebones monument to greed.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The longest navigable underground river in the United States is home to countless blind and albino animals.

An unassuming London park is actually a pilgrimage site for modern clowns.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Only place outside China and India where two overhead DC power lines cross.

One North Dakota man's vast collection of rare rocks, polished orbs, and geological wonders.

One man's quest to save his town with a trail of record-breaking sculptures.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.