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

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

Perhaps the most scandalous statue of America's first president.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

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

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Carved initials which are nearly 500 years old preserve the deposed Queen's presence at Hampton Court Palace.

There’s a hidden military meme engraved on the World War II Memorial.

Memorial built in 1922 in remembrance of WWI casualties.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

A unusual sanctuary for abused and exotic animals in South Jersey.

This huge work of functional public art replaced a landfill in New Jersey's Meadowlands.

Commemorating the spot where the famous scientist fed his pigeons.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.