Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

360° views of the city plus five floors of optical illusions and hands-on science.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

This tiered waterfall is so pretty it may cause visitors to cry tears of their own.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

Northern Ireland's Brobdingnagian stepping stones.

These fantastically named natural pools look like something out of a Scottish myth.

The only theatre in the world constructed specifically for sound movement.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

An Australian lake whose pink hue defies scientific explanation.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Medicinal spa created with the discharge from a geothermal energy plant.

Most-visited and most-photographed slot canyon in the American Southwest.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Rippling sand dunes frozen in the Arizona rock.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.