L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

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

Every equinox this Maya pyramid puts on a spooky ancient light show.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

One of the oldest hospitals in the Americas is now decorated in hallucinatory murals.

A full-size replica of this well-preserved temple lets you take a walk through the Mayan age.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

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

The enigmatic skull gazes out over the ruins of a once-great Mayan city.

An important Mayan religious and trading center dating back to 200 BC.

This massive Maya archaeological site is home to the tallest man-made structure in Belize.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

One part local history, 99 parts gruesome haunted house.

The remains of 50,000 World War I soldiers rest under a towering arch overlooking the Alpine battlefields.

A gorgeous example of 13th-century Gothic architecture.

Pilgrimage site for star-crossed lovers.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.