Arguing within this idyllic, circular volcanic lake is forbidden.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

This remote stretch of sand is a penguin lover's paradise.

Modern megaliths form this work of cosmic, Celtic landscape art.

Rare recess caves fill this unbelievably beautiful Ohio park.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

An alien landscape on the banks of the Aegean Sea.

Temple complex that once housed the famous statue of Nike.

An autonomous republic of Orthodox monks.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

Peruse rare tomes like poetry bound in pearls or books with branches and berries growing out of their spines.

This 12-foot-tall T-rex is the largest K’Nex skeleton sculpture in the world.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A pocket of serenity in hectic Buenos Aires, complete with a peaceful courtyard and massive library.

This former royal palace with gorgeous gardens became the first museum in Morocco.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

The largest radio telescope in the world searches for extraterrestrial life from the remote limestone peaks of southern China.

A rusted metal giant pays tribute to Birmingham’s industrial past.

Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

The walls of the iconic dome are hollow and have a secret stairway.