An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The celebrated eyesore created by starry-eyed sweethearts.

The video game-themed street art first popped up in the French city.

This 18th-century sundial was designed to calculate the date of Easter each year.

A celebration of Colombia’s premier contemporary artist.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

Known as the site of 'El Dorado,' this mysterious lake is rumored to hold gold beneath its waters.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

Single runway interrupted by a busy road that cuts across its middle.

This centuries-old pub boasts a collection of more than 4,500 snippets of neckties from around the world.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Go inside to really appreciate this 500-year-old technological masterpiece.

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

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

A lush indoor jungle fills this bustling Madrid transportation hub.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

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

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The modern birthplace of Irish freedom.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.