This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

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

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The house where John Wilkes Booth conspired with his co-conspirators.

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

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

In the Monastery of São Vicente resides a gallery devoted to a breathtaking collection of seashells.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Originally used to sell brandy, the bull-shaped billboard became an iconic symbol of Spain.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The final resting place of the great navigator, or maybe his brother.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

An effigy of Vancouver's Gastown neighorhood's namesake.

The colorful, smiling concrete silos of Vancouver.

At just six feet two inches deep, it is said by Guiness and Ripley to be the world’s narrowest freestanding office building.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.