A medieval church with largest and oldest collection of Renaissance frescoes in France.

The world's largest reflecting pool is just two centimeters deep.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

When this funny little building went up in the 19th century, most people thought it would simply fall over.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

This building has a giant piercing through one of its corners.

This building was designed to celebrate Italy's victory in World War I.

A landmark in the history of technology and computing is hidden in a tiny Baroque chapel.

This emotive sculpture was originally created for the 1878 World's Fair.

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

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

A fake medieval village in the middle of Turin.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

His "Lionheart" is entombed separately from the rest of his body.

An ancient ossuary in Rouen.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

This mountaintop mariner’s church is packed with model ships and nautical art while hosting an annual maritime festivity for the townsfolk below.

One of the oldest and largest wooden churches in France was very evidently constructed by shipbuilders.