Over 50 whirling pools left behind from the glacial age.

These mansions date back to Chicago's days as a brewer's paradise.

Huge abstract sculptures of the Puerto Rican Flag.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

Romania's triumphal arch looks out over Bucharest.

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The site of Paul Revere's historic two lantern warning.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

This massive redwood tree has a hole in the base big enough to drive through.

A tourist attraction founded around a slumping cabin.