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

Cold war icon and onetime "hole" in the iron curtain.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

Climb inside an iron crystal magnified 165 billion times its normal size.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Baroque celebration of the end of the Great Plague of Vienna.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

This bridge was constructed from the rubble of the infamous Bastille.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

San Francisco's newly reopened hands-on science museum.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Go inside to really appreciate this 500-year-old technological masterpiece.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This elaborate towering structure was once famed for its revolutionary height.

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

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.