Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

This medieval city gate is now a blend of the past and the modern world.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

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

Ancient snack bar of the Roman Empire re-opened.

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

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

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

A restaurant devoted to "trouser grip" wrestling, an ancient form of Viking wrestling that is Iceland's national sport.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

“Invented in Key West, Perfected in Brooklyn."

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

This New York estate was designed to resemble a medieval Scottish castle.

Outsider art meets paleontology at this roadside reptile repository.

A local prank turned town icon.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Huge stone depressions which may have acted as an Incan agricultural experiment.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

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

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.