The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

An Irish Memorial commemorating those who perished due to potato blight.

One of the oldest of its kind.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

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

Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

The first custom-designed building to showcase the works of Dale Chihuly is a wonderland of glass and light.

This unusually shaped fortress houses a blend of centuries-old frescoes and modern art.

If New Orleans is the birthplace of the "cocktail," why does their own museum of cocktail memorabilia beg to differ?

Gorgeous purple flowers drape from the world's largest blossoming plant.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

Holding the most bodies of any cemetery in the United States.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

An enormous, inside-out glass globe built in 1935.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

An art deco ice cream shop covered in vintage train station tiles.