One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Not quite the menace it once was, this monster still has some chops.

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

A modest reminder of treacherous waters at the Golden Gate.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

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

Yo, Adrian!

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The celebrated eyesore created by starry-eyed sweethearts.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This modest marker near Notre Dame identifies the very center of Paris.

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

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.

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

An annual extravaganza of Broadway theater memorabilia.

There are owls with glowing eyes in Herald Square.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.