Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

The tiny, studious rodents greet visitors to the National Archives of Finland.

This lake-bound geographical marker sits at the point where three European countries intersect.

This fantastical icy castle is built anew every winter.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

You can row a boat through this ancient underground reservoir.

This family tattoo parlor has been inking religious pilgrims in the Middle East for 700 years.

One of the largest mud-brick structures in the world.

The tallest minaret in Yemen is 150 feet high and entirely made of mud.

One of Yemen’s oldest and most beautiful mosques was named for the incredible, historical queen buried inside it.

Elaborate patterns adorn the city's disappearing traditional architecture.

The most alien-looking place on Earth.

This giant underground cave chamber can only be accessed through a small opening at the top.

Take the most scenic fjord landscape in Norway and add dramatic red cliffs, warm clear water, and playful dolphins.

These gnarly desert trees produce the prized aromatic resin traded along the ancient incense trail.

The biggest cave system in the Arabian Peninsula is home to a rare variety of blind fish.

An abandoned mountain village in Habib surrounded by walnut, apricot, and pomegranate trees.

This mysterious anthropomorphic statuette is on display at the National Museum of Oman.

This spectacular mosque houses the second-largest chandelier in the world.

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

This lonely tomb is all that remains of a once-bustling ancient trade hub visited by Marco Polo.

This archaeological site boasts temple ruins that date back 5,000 years to the Dilmun culture, and may have been described in the tale of Gilgamesh's search for immortality.

This centuries-old tree tells an unusual tale of vegetation and fertility in the desert.

This unique museum doesn't shy away from highlighting Qatar's role in the history of slavery.