These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

In a quiet residential neighborhood, one restaurant fights to preserve heirloom corn, one tortilla at a time.

To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

Artwork celebrates the local culture in the region around the world’s youngest volcano.

Along this wire fence, travelers have been leaving a particular memento since 2012.

Mosaics created from 11 million cigar bands.

On a small Slovenian island, diners can mix and match a classic cake into dozens of sweet and savory flavor combinations.

The rocks are a time capsule of a 407-million-year-old Earth.

This structure was moved nearly 40 feet while people continued working inside it.

The largest salt lake in the Sahara is mysteriously alluring.

A forlorn fishing village on the coast of Labrador, full of shipwrecks and Spanish gold.

A lake in the middle of the tundra of Quebec is said to be the purest freshwater lake on Earth.

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.

The "dragon babies" of southeastern Europe.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This massive subterranean fissure is known as the "underground Grand Canyon."

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Dine amidst exotic plants at this former royal greenhouse.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

A silly medieval mural preserved on the side of a Viennese house.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.