A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Statue commemorating the use of ether in anesthesia.

A centuries-old church stands as a testament to Boston's "father of architecture."

Dedicated to a colonial woman who was hanged for being a Quaker.

The Boston square dedicated to the dark poet who was born nearby.

This statue intended for children to enjoy became a minor political spat.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

This historic Boston building has gone from personal estate to porn theater and back again.

The massive machine creates cracking displays of indoor lightning.

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

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

Death rituals and sacrifice inside a Peruvian megalith.

An unexpected desert oasis in South America.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

This stone complex marks the urban center of a lost civilization.

Now containing the bones of the actual conquistador, instead of someone else.

A monument to the conquistador became increasingly controversial in the very city that he founded.

A fascinating little museum all about the rich history of Peru’s famous plant.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

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.