The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A huge musical instrument played by the ocean.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

A monument to the art of slicing people open.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

A massive engineering and hydraulic marvel dating back to the 3rd century BC

Medieval streets buried beneath a papal fortress now form an underground city you can walk through.

A whimsical Renaissance fountain sculpture from Florence, world-renowned for defying convention.

Many famous English poets including Elizabeth Barrett Browning are laid to rest at this Swiss-owned cemetery in Florence.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Two mermen, eternally spitting into each other's mouths.

Visit the monolithic tomb of America's most famous general.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.