Where serial killer Aileen Wuornos drank her last beer.

Automatons that were once removed after one fell from the building.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This little sun pays homage to a massive gate that once stood at this location.

This lucky bronze frog was gifted to Madrid by a casino.

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

Ice cream stand, snack bar, and time capsule of milk conveyance.

One of the world's largest amber altarpieces is housed within this reconstructed medieval church.

A building so large that it has its own weather.

Only through the lens of a microscope can visitors see the true treasures inside this museum.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

A tribute to Ponce de Leon's supposed quest for eternal youth.

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

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

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."

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

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

Step into a pastel time capsule where candy is truly dandy.

The site of Martin Luther King Jr.'s arrest as he attempted to have lunch.

Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.