A trading post in the North Pole where children send letters.

Considered by many to be one of the most dangerous highways in Alaska.

The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

The quirky salon doubles as a retro museum run by the world's leading "hairstorian."

Meet 'Big Josh,' the 20-foot-tall muffler man.

Explore 10 acres of environmental sculptures.

An eerie natural formation that looks right back at you.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

Go deep on these fascinating fish, and get a bonus lesson on the importance of marine conservation.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

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

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

Locals pay their respects at a shrine to soccer player Diego Maradona—which claims to contain a real lock of his hair.

Ancient snack bar of the Roman Empire re-opened.

Erotic art covers the walls of the largest ancient pleasure palace.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The glowing blue Nymphaeum of Emperor Tiberius.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A dramatic coastline that’s home to a rare pine tree.

This historic Chinese church was relocated and revived as a museum that preserves and celebrates Chinese art, history, and culture.

At this local mall, visitors are ushered through a 1940s jail exhibit.

Quite simply the largest tree in the world (by volume).