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

The stunning interior of this Gothic church is covered in ornate gold details.

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

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

Small church built in the 19th century for whites and slaves to worship together.

This colorful gate stands as an entrance to the walled city of Old San Juan.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

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 portion of a lovely Belize beach is infested with (harmless) sharks and rays.

After a traumatic encounter with a six-foot eel, one Galway baker started making a daily loaf of sourdough in its shape.

An unusual manor of stunning beauty, born out of a crippling disease.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

You may get stranded and everyone's peeing in the water, but at least there's cocktails!

Uninhabited islet in the Caribbean is the sanctuary of giant lizards.

The rusted remains of a victim of Hurricane Ike.

A 220-foot deep watery drop-off, filled with marine life.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

There has been an astronomical clock on this spot since the 14th century.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.