A towering monument in Spain has proven to be more labor-intensive than initially planned.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A lush indoor jungle fills this bustling Madrid transportation hub.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

This luxury shopping lane has been protected by its own tiny police force for over a century.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

The only surviving prototype for Buckminster Fuller's house of the future.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

There aren't too many operational funiculars around, but Pittsburgh has two!

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Yo, Adrian!

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This 1920s Dutch barge is now a floating bookstore.

The first American department store, and home to the largest operating musical instrument in the world.

Cozy basement bar sports an inventory of over 2,000 beers.

The site of Paul Revere's historic two lantern warning.

Introducing the Green Fairy to her fawning masses.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.