This small chapel is built of human bones and decorated with a golden skeleton.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

The Lowcountry color with the power to stop evil from entering a home.

A hidden three-foot-wide house separates these two regal churches.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

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.

Elaborate tile work in this railway station tells the story of Portugal.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

A majestic hotel for dreamers rises from the center of a fairytale wood.

Ancient catacombs form the foundation for this Rococo orgy of a church.

The corpse bride of Portugal.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

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.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.