This lucky stone from Ireland is embedded on the corner of a Reno casino to grant luck

The Underground railway station and its Cubist/Art Deco statue are so evocative of 1920s/30s London that one almost expects to see Poirot on the stairs.

As the oldest natural history museum in the Americas, these halls contain everything from dinosaur bones to biological samples collected by Lewis and Clark.

The devil-defying mark left by a saint as a boy is visible inside Lisbon's cathedral.

The scorched Lisbon church that survived two earthquakes and a massive fire.

Step back in time at this 19th-century kiosk.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

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

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

This is the place where U2’s lead singer got his nickname.

This artificial cave looks like something out of a fairytale.

A massive relic of the communist era of Berlin.

Ever-changing museum dedicated to graffiti and contemporary street art.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

A century-old shot ball factory tower is open to the public once a year.

This monumental work of art symbolizes the coming together of a previously divided city.

Metro station with a claim to rock n' roll fame.

This concrete residential area doubles as an open-air gallery.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.