The enormous isokinetic structure hangs within a science center in Estonia.

Hidden inside a gift shop that doubles as a museum, this gargantuan yo-yo can only be operated by crane.

A giant concrete orb in far north Iceland marks the ever-shifting boundary.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

This suburban British town holds secrets that would have made the druids proud.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

Hidden in magnificent rolling countryside, see what may be the largest modern stone circle in the world at Wisconsin's very own "Stonehenge”

Magnificent frescoes decorate the interior of this Romanesque church, which also showcases an unusual phenomenon during winter solstice.

Winter and summer solstice aligned sculpture in the middle of nowhere.

On the summer solstice each year, shadows align with a 14,000 square foot painting to reveal a secret message.

A circle of stones on a hilltop in Peru’s high jungle, aligned with the winter solstice and largely ignored by archaeologists.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

Once a year, thousands of naked cyclists flood the streets of a Seattle neighborhood.

Iceland: home to volcanoes, waterfalls and, apparently, Santa?

An entire home filled with over 3,000 pieces of Santa memorabilia in glass cases, walls, on Christmas trees, and even in the bathroom.

A hamlet full of permanent Christmas spirit holds one of the earliest theme parks in the United States.

There is an art, a science, and certainly a responsibility to occupying The Big Red Chair, and this is where it's learned.

A mother’s sweet tradition lives on with this unique memorial.

San Francisco’s century-old Christmas Tree.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

Every December the Wannalancit Mills lights a Christmas Tree over the old mill's smokestack.

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.