A UFO-shaped event building originally intended to be a science museum showcasing the future.

The former home of an Italian artist is now a shrine to his ambitious works.

This large, circular tomb is the final resting place of the first emperor of Rome.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

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

A statue representing a lost Roman profession that was vandalized for centuries.

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

A curious collection dedicated to human and animal anatomy and pathology.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A public urinal so pretty, it was declared a national monument.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

This family-owned canteen has been selling goat milk ice cream since 1933.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

A place to see how French aristocrats lived in the early 1900s.

This saucy statue once caused outrage among locals.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

After this historic church was destroyed by World War II bombing, its blackened shell was left standing as a monument.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Model Trains and Much More in Hamburg.