Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

Alien rock formations grown from the sands of an Australian national park.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

The “Thumb” of Mauritius provides a 360 degree view of the entire country.

Khmer Rouge's high security prison.

The world's largest military aircraft cemetery.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Last stop before the top of the highest peak in the world.

A beautiful opera house in the heart of Amazonia has recently restarted performances after a 90-year hiatus.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The most powerful waterfall in all of Europe.