The sign at the garden gate reads: "These Plants Can Kill."

One of Australia's largest secondhand bookstores.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

The final resting place for the remains of 143 Habsburg royalty.

The man who gave his name to magnetic measurement is buried in the city where he did his best work.

The Goose Girl of Göttingen, Germany might well be the most kissed girl in the world.

These beautiful objects represent beautiful ideas.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Thousands of flowers create enchanting pink tunnels over the city streets.

WWI hospital ship lost in a cyclone turns up on the coast of Fraser Island, where she remains rusted and forgotten.

Legends surround an ancient tree trunk riddled with nails for good luck.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A second generation sun-powered marvel lights up the night.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A small square plaque marks a failed assassination attempt that could have changed history.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

This chimerical bridge/tunnel appears to dead end right into the sea.

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

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

There's nothing shrimpy about the world's largest artificial prawn.

Eighty million natural history specimens call this gargantuan museum home.