A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The island residents are known for taking their quirky sense of humor with them to the grave.

"We Seceded Where Others Failed."

This classic red schoolhouse is said to have been where Mary and her little lamb went to school.

On a side street near the interstate is the building where the famous anarchist once owned an ice cream parlor.

An encyclopedic collection of mammal penises.

This natural rock formation features seemingly unnatural vertical ridges that have been blamed on elves.

A giant red chair bolted to a rock on a remote mossy hillside in Iceland.

These enlarged egg sculptures represent the native birds of eastern Iceland.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

A sulfuric martian landscape that looks far better than it smells.

Three columns of volcanic rock shoot out of the ocean.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The most powerful waterfall in all of Europe.

This elegant arc of a waterfall marks a religious turning point.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.