38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

The world's oldest operating jazz club has been in operation since May 1934.

This sprawling bookstore spans four floors and has more than a million books in stock.

A forgotten "city of water" underneath the famous Trevi district.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A massive marble foot is tucked away in a small alley near the Pantheon.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The celebrated eyesore created by starry-eyed sweethearts.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This bridge was constructed from the rubble of the infamous Bastille.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.