What started as a collection of vintage tractors turned into a museum filled with cars, radios, and other oddities.

A Hollywood-sign replica with a typo on a remote hillside.

This dazzling Art Nouveau mansion is now home to the Modern Art Gallery Subotica.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Something's missing between the arcades of the Palazzo della Ragione in "the city of the three withouts."

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

Go inside to really appreciate this 500-year-old technological masterpiece.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The famous greeting card maker owns a collection of paintings by the famed surrealist.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.