The skulls and bones of thousands of soldiers line the walls of this small Italian chapel.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

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

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

A fairy tale castle in modern Rome.

The astonishing collection of an infamous criminologist.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.

A fortified palace in the shape of a ship on the Thiou river.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This communist country can still appreciate its fragrant past.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

This small Milan street is filled with colorful homes and a rich history.

Claude Monet was baptized in this lavishly ornate Paris church.

The final resting place of the "father of special effects."

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

This Parisian café sticks almost exclusively to an ethos of reuse.

This museum houses an imposing skeleton army comprised of creatures great and small.

France's national museum of scientific and industrial instruments.