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.

On this tiny spot of land in the middle of Lake Titicaca the only ones who do the knitting are the men.

The Uros people live on floating reed islands in lake Titicaca.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

Nordic giants resurrected from the sea and restored to their former greatness.

Old Danish castle immortalized in Shakespeare's Hamlet.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

A cruise terminal that changes the atmosphere of Red Hook's industrial waterfront.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

The curious underground history of keeping Paris clean.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

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

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

360° views of the city plus five floors of optical illusions and hands-on science.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The remains of the great moral philosopher reside in a university in London.

Step inside Lucy, the world's largest "elephant."

World Trade Center memorial likened to a woman's sexual organ.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."